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The generalized method of quantitative description of the uniaxial anisotropy in weak ferromagnet rhombohedral calcite type structure crystals with S-state ions / G. V. Bondarenko [et al.] // J. Magn. Magn. Mater. - 2013. - Vol. 335. - P. 90-96, DOI 10.1016/j.jmmm.2013.01.037. - Cited References: 35 . - ISSN 0304-8853
Кл.слова (ненормированные):
Weak ferromagnetism -- Magnetic anisotropy -- Impurity
Аннотация: The method for investigation of the uniaxial and hexagonal anisotropies in weakly ferromagnetic rhombohedral FeBO3 crystals with the Fe2þ magnetic impurity with the use of the single-ion and pair approximation has been developed. In the framework of this method, a quantitative discrepancy between theoretical and experimental data on a uniaxial ﬁeld has been eliminated. The energy contributions to the hexagonal anisotropy that are caused by the Dzyaloshinsky–Moriya interaction, the crystal ﬁeld of Fe3þ ions and the temperature dependence of this anisotropy were analytically treated. The experimental temperature dependence of the hexagonal anisotropy of FeBO3 crystals is explained. It is shown that the compensation point and the typical temperature dependence of the hexagonal anisotropy result from the competition of the contributions of Fe3þ and Fe2þ ions. It is shown that respective considerable contributions to the anisotropy of Fe3þ and Fe2þ ions are made by the cubic symmetry and the uniaxial symmetry of the exchange ‘‘single-ion’’ type. The anisotropy constants for FeBO3 crystal was obtained by using the described results. It was shown, that for the calcite type structure crystals (iron borate and manganese carbonate) with S-state ions, the single ion and pair models (which previously raised doubts in their validity and accuracy) describe the experimental data good enough.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Bondarenko, G. V.; Бондаренко, Геннадий Васильевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Sosnin, V. M.; Соснин, Виктор Михайлович; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович
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Магнитный круговой дихроизм и природа ферромагнетизма в коллоидных наночастицах золота / А. Э. Соколов [и др.] // Письма в Журн. эксперим. и теор. физ. - 2013. - Т. 97, Вып. 2. - С. 104-107DOI 10.7868/S0370274X13020070
Аннотация: Измерены спектры оптического поглощения и магнитного кругового дихроизма (МКД) в интервале длин волн 350-1150 нм для серии коллоидных растворов наночастиц Au со средним размером 6.0 нм с различной степенью хиральности тиолятного покрытия. Вид спектров поглощения и МКД свидетельствует о дипольном характере межзонных переходов 5d-6(sp)-орбиталей. Отсутствие зависимости (в пределах погрешности эксперимента) МКД от вида покрытия позволяет исключить гипотезу об орбитальной природе магнетизма. Делается вывод о преобладающей роли спиновой поляризации в формировании магнетизма наночастиц золота с тиолятным покрытием.

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Переводная версия Magnetic Circular Dichroism and the Nature of Ferromagnetism. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Соколов, Алексей Эдуардович; Sokolov, A.E.; Овчинников, Сергей Геннадьевич; Ovchinnikov, S. G.; Заблуда, Владимир Николаевич; Zabluda, V.N.; Кальсин, А. М.; Зубавичус, Я. В.
}
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Magnetic circular dichroism and the nature of ferromagnetism / A. E. Sokolov [et al.] // JETP Letters. - 2013. - Vol. 97, Is. 2. - P. 98-101DOI 10.1134/S0021364013020124
Аннотация: The spectra of optical absorption and of magnetic circular dichroism (MCD) have been measured in the 350–1150 nm wavelength range for a set of colloidal solutions containing Au nanoparticles with the average size of6 nm having thiolate coatings with different degrees of chirality. The form of absorption and MCD spectra sug-gests the dipole character of interband transitions involving the 5d–6(sp) orbitals. The absence (within theexperimental error) of the dependence of the MCD spectra on the coating type rules out the hypothesis on theorbital nature of the observed magnetism. We argue that the spin polarization plays the dominant role in themagnetism of gold nanoparticles with a thiolate coating.

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Публикация на русском языке Магнитный круговой дихроизм и природа ферромагнетизма в коллоидных наночастицах золота. - [S. l. : s. n.]

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, AN Nesmeyanov Organoelement Cpds Inst, Moscow 119991, Russia
Natl Res Ctr, Kurchatov Inst, Kurchatov Ctr Synchrotron Radiat & Nanotechnol, Moscow 123182, Russia

Доп.точки доступа:
Sokolov, A. E.; Соколов, Алексей Эдуардович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Zabluda, V. N.; Заблуда, Владимир Николаевич; Kal’sinc, A. M.; Zubavichusd, Ya.V.
}
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Solid state synthesis and characterization of ferromagnetic nanocomposite Fe-In2O3 thin films / V. G. Myagkov [et al.] // J. Alloys Compd. - 2014. - Vol. 612. - P. 189-194, DOI 10.1016/j.jallcom.2014.05.176. - Cited References: 56 . - ISSN 0925-8388. - ISSN 1873-4669

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
HIGH-TEMPERATURE FERROMAGNETISM
   PHASE-FORMATION
   In2O
   OXIDE
   NANOPARTICLES
   CO
   SEMICONDUCTORS
   NANOCRYSTALS
   COMBUSTION
   SYSTEMS
Кл.слова (ненормированные):
Thermite reactions -- Reactive films -- Ferromagnetic nanocomposite films -- Transparent conducting oxides
Аннотация: We have successfully synthesized ferromagnetic Fe-In2O 3 nanocomposite thin films for the first time using the thermite reaction Fe2O3 + In = In2O3 + Fe. The initial In/Fe2O3 bilayers were obtained by the deposition of In layers on α-Fe2O3 films. The reaction occurs in a self-propagating mode in a homogeneous thermal film plane field at heating rates above 20 K/s and at temperatures above initiation temperature T[[d]]in[[/d]] ~ 180 °C. At heating rates lower than 20 K/s the mixing of the In and Fe2O3 layers occurs across the whole In/Fe2O3 interface and the synthesis of the ferromagnetic α-Fe phase starts above the initiation temperature T[[d]]in[[/d]] = 180 °C. X-ray diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetic measurements were used for phase identification and microstructure observation of the synthesized Fe-In2O3 samples. The reaction products contain (1 1 0) textured α-Fe nanocrystals with a diameter around 100 nm and surrounded by an In2O3 matrix. These results enable new efficient low-temperature methods for synthesizing ferromagnetic nanocomposite films containing ferromagnetic nanoclusters embedded in transparent conducting oxides. © 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia

Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Zhigalov, V. S.; Жигалов, Виктор Степанович; Bykova, L. E.; Быкова, Людмила Евгеньевна; Mikhlin, Yu. L.; Volochaev, M. N.; Bondarenko, G. N.; Бондаренко, Галина Николаевна
}
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Ferromagnetism in single-valent manganites / I. O. Troyanchuk [et al.] // J. Alloys Compd. - 2015. - Vol. 619. - P. 719-725, DOI 10.1016/j.jallcom.2014.08.236. - Cited References: 46. - The authors would like to thank J.B. Goodenough for the fruitful discussion. This work has been supported by Belarusian Republican Foundation for Fundamental Research (Grant F14R-040). . - ISSN 0925-8388. - ISSN 1873-4669

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
PHASE-SEPARATION
   DOPED MANGANITES
   DOUBLE EXCHANGE
   DIFFRACTION
   OXIDES
   NMR
Кл.слова (ненормированные):
Magnetically ordered materials -- Solid state reactions -- Exchange and superexchange -- Magnetic measurements -- Neutron diffraction
Аннотация: Structural and magnetization measurements have been performed on the La0.7Sr0.3Mn0.85 Nb 0.15 - x 5 + Mg x 2 + O3 stoichiometric compounds. With rise of the Mg2+ content the formal oxidation state manganese increases from +3 ( x = 0 ) up to +3.55 ( x = 0.15 ) . The compositions with 0 ⩽ x ≤ 0.08 undergo a structural transition from rhombohedral to orthorhombic symmetry below room temperature whereas x = 0.1 and x = 0.15 compounds are rhombohedral down to 2 K. The structural parameters evidence that the orthorhombic phase is not long-range orbitally ordered and that the structural transition is associated with a steric effect. The Mg-free compound is ferromagnetic with the Curie point of around 150 K and a magnetic moment of 3.1 μ B /Mn. The substitution of Nb5+ with Mg2+ leads to a gradual weakening of the ferromagnetic component while in the x = 0.15 compound A-type antiferromagnetic short-range order is stabilized in spite of macroscopic R 3 ¯ c symmetry. All the compositions show insulating behavior. It is suggested that ferromagnetism is originated from superexchange interactions via oxygen. Covalence enhances the positive part of the superexchange interactions whereas structural disorder induced by Nb5+ and Mg2+ ions leads to suppression of ferromagnetism.

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Держатели документа:
Sci Pract Mat Res Ctr NAS Belarus, Minsk 220072, Byelarus
Helmholtz Zentrum Berlin, D-14109 Berlin, Germany
Joint Inst Nucl Res, Dubna 141980, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
ISMRA Univ Caen, UMR Associee CNRS 6508, Lab CRISMAT, F-14050 Caen, France
Univ Caen, F-14050 Caen, France

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Sikolenko, V.; Efimov, V.; Volkov, N. V.; Волков, Никита Валентинович; Tobbens, D. M.; Ritter, C.; Raveau, B.
}
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Role of superexchange interactions in the ferromagnetism of manganites / I. O. Troyanchuk [et al.] // J. Exp. Theor. Phys. - 2015. - Vol. 120, Is. 1. - P. 97-102, DOI 10.1134/S1063776115010173. - Cited References:25. - This work was supported by the Belarussian Foundation for Basic Research, project no. F12SO-026. . - ISSN 1063. - ISSN 1090-6509. -

РУБ Physics, Multidisciplinary
Рубрики:
PHASE
NMR
Аннотация: Compound La0.7Sr0.3Mn0.85Nb0.15O3, in which manganese ions are in an oxidation state close to 3+, are studied by neutron diffraction and magnetic measurements. This compound is shown to be a ferromagnet with T C = 145 K and a magnetic moment of 3.1 μB/Mn at T = 10 K. No signs of cooperative orbital ordering are detected. When Mg2+ ions substitute for some Nb5+ ions, Mn4+ ions appear but ferromagnetism is not enhanced. An increase in the structural distortions leads to a decrease in the ferromagnetic component. The ferromagnetic state is assumed to be caused by substantial hybridization of the e g orbitals of manganese and oxygen, which increases the positive part of the superexchange interactions.

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Публикация на русском языке Роль сверхобменных взаимодействий в ферромагнетизме манганитов [Текст] / И. О. Троянчук [и др.] // Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 147 Вып. 1. - С. 112-118

Держатели документа:
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Minsk 220072, Byelarus.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Helmholtz Ctr Berlin, D-14109 Berlin, Germany.
Joint Inst Nucl Res, Dubna 141980, Moscow Oblast, Russia.
Inst Laue Langevin, F-38042 Grenoble 9, France.

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Volkov, N. V.; Волков, Никита Валентинович; Sikolenko, V.; Efimova, E. A.; Ritter, C.
}
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    Room temperature magneto-transport properties of nanocomposite Fe–In2O3 thin films / I. A. Tambasov [et al.] // Physica B. - 2015. - Vol. 478. - P. 135-137, DOI 10.1016/j.physb.2015.08.054. - Cited References: 28. - This study was supported by the Russian Foundation for Basic Research (Grants # 15-02-00948-A,), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), and by the program of Foundation for Promotion of Small Enterprises in Science and Technology (No 6662 FY2015) ("UMNIK" program). . - ISSN 0921-4526
   Перевод заглавия: Магнитно-транспортные свойства композитных Fe –In2O3 тонких пленок при комнатной температуре

РУБ Physics, Condensed Matter
Рубрики:
Doped In2O3 Films
   High-performance
   Indium oxide
   Transistors
   Magnetoresistance
   Ferromagnetism
Кл.слова (ненормированные):
Indium oxide -- Fe-In2O3 thin films -- Weak localization -- Disordered semiconductors
Аннотация: A ferromagnetic Fe–In2O3 nanocomposite thin film has been synthesized by the thermite reaction Fe2O3+In→Fe–In2O3. Measurements of the Hall carrier concentration, Hall mobility and magnetoresistance have been conducted at room temperature. The nanocomposite Fe–In2O3 thin film had n=1.94·1020 cm−3, μ=6.45 cm2/Vs and negative magnetoresistance. The magnetoresistance for 8.8 kOe was ~−0.22%.The negative magnetoresistance was well described by the weak localization and model proposed by Khosla and Fischer.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk Worker 31, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny prospect 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Tambasov, I. A.; Тамбасов, Игорь Анатольевич; Gornakov, K. O.; Myagkov, V. G.; Мягков, Виктор Григорьевич; Bykova, L. E.; Быкова, Людмила Евгеньевна; Zhigalov, V. S.; Жигалов, Виктор Степанович; Matsynin, A. A.; Мацынин, Алексей Александрович; Yozhikova, E. V.
}
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Ferromagnetic and spin-wave resonance in FexNi1-x (0∠x∠1) films / I. G. Vazhenina [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2015. - Vol. 233-234: Achievements in Magnetism. - P. 682-685, DOI 10.4028/www.scientific.net/SSP.233-234.682 . - ISSN 1662-9779. - ISSN 978-3-038
Кл.слова (ненормированные):
Electroless deposited method -- Ferromagnetic and spin-wave resonance -- Heterogeneity structure -- Invar alloy Fe-Ni -- Ferromagnetic materials -- Ferromagnetism -- Magnetism -- Multilayers -- Nickel -- Resonance -- Dispersion relations -- Electroless -- FeNi alloys -- Invar alloy -- Magnetic heterogeneity -- Resonance field -- Spin wave resonances -- Wave spectroscopy -- Spin waves
Аннотация: We report ferromagnetic and spin-wave resonance measurements on the electroless deposited thin films of Fe-Ni alloy including alloy with invar content. From spin-wave resonance spectrum we defined the dependences of resonance fields on the number of mode. Analysis of this spectrum shows that positions of resonance fields are described by the Kittel dispersion relation. The type and the size of magnetic heterogeneity is estimated by the spin-wave spectroscopy technique. © (2015) Trans Tech Publications, Switzerland.

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Доп.точки доступа:
Perov, N. \ed.\; Semisalova, A. \ed.\; Vazhenina, I. G.; Важенина, Ирина Георгиевна; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Chekanova, L. A.; Чеканова, Лидия Александровна; Stolyar, S. V.; Столяр, Сергей Викторович; Yakovchuk, V. Yu.; Яковчук, Виктор Юрьевич; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
}
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Ferromagnetism and strong magnetic anisotropy of the PbMnBO4 orthoborate single crystals / A. Pankrats [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 414. - P. 82-89, DOI 10.1016/j.jmmm.2016.04.042. - Cited References: 20. - We acknowledge the assistance of A. Dubrovsky in magnetic measurements. - This work was supported by the Russian Foundation for Basic Research, Projects nos. 13-02-00897 and 16-02-00563. MVE thanks for support the Russian Government Program of Competitive Growth of the Kazan Federal University, decision no. 930_p, May 22, 2015. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
PbMBO4 M
   Resonance
   Symmetry
   Mn
   Fe
   Cr
Кл.слова (ненормированные):
Strong ferromagnetic anisotropy -- Ferromagnetic resonance -- Exchange interactions
Аннотация: The PbMnBO4 orthoborate single crystals were first grown and their magnetic properties and ferromagnetic resonance were studied. It was found that the ferromagnetic state below the Curie temperature TC=31 K is characterized by the strong magnetic anisotropy. The significant effective anisotropy fields of PbMnBO4 determine the energy gap in the FMR spectrum, which is extraordinary large for ferromagnets (112 GHz at T=4.2 K). It was shown that the static Jahn-Teller effect characteristic of the Mn3+ ion leads to both the ferromagnetic ordering and the strong magnetic anisotropy in the crystal. In the strong external magnetic field the induced ferromagnetic ordering is retained in the crystal above the Curie temperature up to the temperatures multiply higher than TC. A weak anomaly of the dielectric permittivity was observed in PbMnBO4 at the Curie temperature at which the long-range ferromagnetic order is established. © 2016 Elsevier B.V. All rights reserved.

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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics, Kazan Federal University, Kazan, Russian Federation

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Sablina, K. A.; Саблина, Клара Александровна; Eremin, M.; Balaev, A. D.; Балаев, Александр Дмитриевич; Kolkov, M.; Колков, Максим Игоревич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Bovina, A. F.; Бовина, Ася Федоровна
}
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10.

Kagan, M. Y.
Manifestation of the upper Hubbard band in the 2D Hubbard model at low electron density / M. Y. Kagan, V. V. Val'kov, P. . Woelfle // Low Temp. Phys. - 2011. - Vol. 37, Is. 9-10. - P. 834-839 ; Физика низких температур, DOI 10.1063/1.3670026. - Cited References: 31. - This work was supported by RFBR Grants No. 11-0200798 and 11-02-00741. . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
2-DIMENSIONAL FERMI GAS
   LIQUID BEHAVIOR
   SPECTRAL FUNCTIONS
   TRANSITION METALS
   SUPERCONDUCTIVITY
   FERROMAGNETISM
   DIMENSIONS
   SCATTERING
   STATE
Кл.слова (ненормированные):
electron density -- electronic density of states -- Fermi liquid -- Green's function methods -- Hubbard model
Аннотация: We consider the 2D Hubbard model in the strong-coupling case (U > > W) and at low electron density (nd(2) ≪1). We find an antibound state as a pole in the two-particle T-matrix. The contribution of this pole in the self-energy reproduces a two-pole structure in the dressed one-particle Green-function similar to the Hubbard-I approximation. We also discuss briefly the Engelbrecht-Randeria mode which corresponds to the pairing of two holes below the bottom of the band for U >> W and low electron density. Both poles produce nontrivial corrections to Landau Fermi-liquid picture already at low electron density but do not destroy it in 2D.

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Держатели документа:
[Kagan, M. Yu.] PL Kapitza Inst Phys Problem, Moscow 119334, Russia
[Val'kov, V. V.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Woelfle, P.] Karlsruhe Inst Technol, Inst Theoret Condensed Matter Phys, D-76131 Karlsruhe, Germany
ИФ СО РАН
P.L. Kapitza Institute for Physical Problem, 2 ul. Kosygina, Moscow 119334, Russian Federation
Kirensky Institute of Physics, Akademgorodok, 50, bld. 38, Krasnoyarsk 660036, Russian Federation
Institute for Theoretical Condensed Matter physics, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, Karlsruhe D-76131, Germany

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Woelfle, P.

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11.

Relaxation of low-temperature magnetoresistance and magnetization of polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3 / K. A. Shaykhutdinov [et al.] // J. Phys. D. - 2011. - Vol. 44, Is. 25. - Ст. 255001, DOI 10.1088/0022-3727/44/25/255001. - Cited References: 34. - This work was partially supported by the Lavrentyev Competition of the Young Scientist's Projects of the Siberian Branch of the Russian Academy of Sciences, Project No 12. The authors are grateful to A D Balaev and V M Sosnin for useful discussions on the results. . - ISSN 0022-3727

РУБ Physics, Applied
Рубрики:
INSULATOR-METAL TRANSITION
   GRANULAR FILMS
   NANOPARTICLES
   PR0.7CA0.3MNO3
   PERCOLATION
   MANGANITES
Кл.слова (ненормированные):
Antiferromagnetic boundaries -- Characteristic value -- Ferromagnetic domains -- Ferromagnetic metal -- Lanthanum manganites -- Logarithmic law -- Low temperatures -- Magneto-resistive effect -- Polycrystalline -- Relative orientation -- Relaxation of magnetization -- Temperature fluctuation -- Time evolutions -- Time interval -- Tunnel magnetoresistance -- Antiferromagnetism -- Electric resistance -- Europium -- Ferromagnetic materials -- Ferromagnetism -- Grain boundaries -- Grain size and shape -- Lanthanum compounds -- Lead -- Magnetic domains -- Magnetic moments -- Magnetoelectronics -- Magnetoresistance -- Manganese oxide -- Magnetization
Аннотация: Hysteresis and relaxation of magnetoresistance and magnetization of substituted (La0.5Eu0.5)(0.7)Pb0.3MnO3 lanthanum manganite in a low-temperature region (< 40 K) are investigated. It is shown that at these temperature features of the magnetoresistive effect are determined mainly by spin-dependent tunnelling of carriers via insulating grain boundaries. As was demonstrated previously, the grain boundaries may be antiferromagnetically ordered. Therefore, relaxation of magnetization and resistance is determined by the processes of relative orientation of the magnetic moments of ferromagnetic domains neighbouring the antiferromagnetic boundary of ferromagnetic domains under the action of temperature fluctuations. It is shown that relaxation follows the logarithmic law within the time interval t similar to 10(2)-3x10(3) s. A comparison between time evolutions of the magnetic moment and resistance shows that magnetoresistance and magnetization are related as delta R = delta M-n, where n = 2.5. The obtained value n is close to the characteristic value n = 2 for tunnel magnetoresistance of granular ferromagnetic metal/insulator systems.

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Держатели документа:
[Shaykhutdinov, K. A.
Balaev, D. A.
Semenov, S. V.
Popkov, S. I.
Dubrovskiy, A. A.
Sapronova, N. V.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семенов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Sapronova, N. V.; Volkov, N. V.; Волков, Никита Валентинович
}
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12.

Electronic Structure of p-Type La1-xMx2+MnO3 Manganites in the Ferromagnetic and Paramagnetic Phases in the LDA plus GTB Approach / V. A. Gavrichkov [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 5. - P. 860-876, DOI 10.1134/S1063776111030101. - Cited References: 47. - This study was supported financially by integration project no. 40 of the Ural and Siberian Branches of the Russian Academy of Sciences, the program "Strong Electron Correlations" of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 10-02-00251-a). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
DOUBLE-EXCHANGE
   COLOSSAL MAGNETORESISTANCE
   THIN-FILMS
   PHYSICS
   LA1-XSRXMNO3
   RESISTIVITY
   SEPARATION
   TRANSPORT
   MODEL
Кл.слова (ненормированные):
Complex structure -- Cubic materials -- Ferromagnetic phase -- Half metals -- Jahn Teller effect -- Metal properties -- Metal types -- Orbitals -- P-type -- Paramagnetic phase -- Paramagnetic phasis -- Quasi particles -- Spectral intensity -- Spin projections -- Strong electron correlations -- Barium -- Density functional theory -- Electron correlations -- Electron density measurement -- Electronic properties -- Electronic structure -- Fermi level -- Ferromagnetic materials -- Ferromagnetism -- Manganese oxide -- Manganites -- Paramagnetic materials -- Paramagnetism -- Valence bands -- Lanthanum
Аннотация: The band structure, spectral intensity, and position of the Fermi level in doped p-type La1-xMx2+ MnO3 manganites (M = Sr, Ca, Ba) is analyzed using the LDA + GBT method for calculating the electronic structure of systems with strong electron correlations, taking into account antiferro-orbital ordering and using the Kugel-Khomskii ideas and real spin S = 2. The results of the ferromagnetic phase reproduce the state of a spin half-metal with 100% spin polarization at T = 0, when the spectrum is of the metal type for a quasiparticle with one spin projection and of the dielectric type for the other. It is found that the valence band becomes approximately three times narrower upon a transition to the paramagnetic phase. For the paramagnetic phase, metal properties are observed because the Fermi level is located in the valence band for any nonzero x. The dielectrization effect at the Curie temperature is possible and must be accompanied by filling of d(x) orbitals upon doping. The effect itself is associated with strong electron correlations, and a complex structure of the top of the valence band is due to the Jahn-Teller effect in cubic materials. DOI: 10.1134/S1063776111030101

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Публикация на русском языке Электронная структура манганитов La[1-x]M[x]2+MnO[3] p-типа в ферромагнитной и парамагнитной фазах в рамках LDA+GTB-подхода [Текст] / В. А. Гавричков [и др.] // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 5. - С. 983-1000

Держатели документа:
[Gavrichkov, V. A.
Ovchinnikov, S. G.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Gavrichkov, V. A.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Nekrasov, I. A.] Russian Acad Sci, Ural Branch, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Ural Branch, Inst Met Phys, Ekaterinburg 620990, Russia
ИФ СО РАН
Siberian Branch, Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Ural Branch, Institute of Electrophysics, Russian Academy of Sciences, Yekaterinburg, 620016, Russian Federation
Ural Branch, Institute of Metal Physics, Russian Academy of Sciences, Yekaterinburg, 620990, Russian Federation

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Nekrasov, I. A.; Pchelkina, Z. V.
}
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13.

Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3 / K. A. Shaykhutdinov [et al.] // J. Appl. Phys. - 2011. - Vol. 109, Is. 5. - Ст. 53711, DOI 10.1063/1.3559303. - Cited References: 20. - This study was partially supported by the Russian Foundation for Basic Research, Project No. 08-02-00259a and the Lavrentyev Competition of the Young Scientists' Projects of the Siberian Branch of the Russian Academy of Sciences, Project No. 12. . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
RESISTIVITY MINIMUM
MANGANITES
FILMS
Кл.слова (ненормированные):
Antiferromagnets -- Electrical resistances -- Ferromagnets -- Field dependence -- Inter-grain -- Lanthanum manganites -- Low temperatures -- Low-temperature resistance -- Polycrystalline -- Temperature dependence -- Tunnel contacts -- Antiferromagnetic materials -- Europium -- Ferromagnetic materials -- Ferromagnetism -- Hysteresis -- Lead -- Magnetic field effects -- Magnetoelectronics -- Magnetoresistance -- Magnets -- Manganese oxide -- Paramagnetism -- Superconducting materials -- Electric resistance
Аннотация: The behavior of temperature dependences of electrical resistance and magnetoresistance of polycrystalline substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 at low temperatures was thoroughly studied. A broad hysteresis was found in the field dependences of electrical resistance in the low-temperature region. Above 40 K, no hysteresis feature was observed. The temperature T = 40 K corresponds to the temperature of minimum electrical resistance and the temperature T-N to the antiferromagnet-paramagnet phase transition of the material of the intergrain boundaries. In this work we propose a model which explains the observed features of the rho(T) and rho(H) curves at temperatures below T-N by the formation of a network of ferromagnet-antiferromagnet-ferromagnet tunnel contacts. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559303]

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Держатели документа:
[Shaykhutdinov, K. A.
Popkov, S. I.
Semenov, S. V.
Balaev, D. A.
Dubrovskiy, A. A.
Sablina, K. A.
Sapronova, N. V.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shaykhutdinov, K. A.
Balaev, D. A.
Dubrovskiy, A. A.
Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Semenov, S. V.; Семенов, Сергей Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Sablina, K. A.; Саблина, Клара Александровна; Sapronova, N. V.; Volkov, N. V.; Волков, Никита Валентинович
}
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14.

Val'kov, V. V.
Electron spectrum and heat capacity of heavy fermions in the canted phase of antiferromagnetic intermetallides / V. V. Val'kov, D. M. Dzebisashvili // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 2. - P. 301-318, DOI 10.1134/S1063776110020147. - Cited References: 41. - This study was supported by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences, interdisciplinary integration project no. 53 of the Siberian Branch of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 07-02-00226). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
PERIODIC ANDERSON MODEL
   PRESSURE-INDUCED SUPERCONDUCTIVITY
   KONDO-LATTICE
   FERROMAGNETISM
   FLUCTUATIONS
   COEXISTENCE
   CERHIN5
   SYSTEMS
   DIAGRAM
   CENISN
Кл.слова (ненормированные):
Antiferromagnetic phase -- Antiferromagnetics -- Antiferromagnets -- Electron spectrum -- Electronic heat capacity -- Energy spectra -- Experimental data -- External magnetic field -- Heat capacities -- Heavy fermion -- Low temperatures -- Magnetic sublattices -- Magnetic subsystems -- Sommerfeld constant -- Structural rearrangement -- Temperature dependence -- Antiferromagnetism -- Cerium -- Cerium compounds -- Fermions -- Magnetic fields -- Phase transitions -- Specific heat -- Spectroscopy -- Antiferromagnetic materials
Аннотация: The energy spectrum of heavy fermions in an external magnetic field is calculated for canted magnetic sublattices of antiferromagnetic intermetallides. This makes it possible to determine low-temperature features of electronic heat capacity of heavy-fermion antiferromagnets with the metal-type ground state taking into account the structural rearrangement of the magnetic subsystem. The calculated temperature dependences of the magnetization, heat capacity, and Sommerfeld constant in the vicinity of the point of transition to the antiferromagnetic phase correlate with experimental data obtained for heavy-fermion antiferromagnets PuGa3, Ce2Au2Cd, YbNiSi3, and PuPd5Al2.

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Публикация на русском языке Электронный спектр и теплоемкость тяжелых фермионов в скошенной фазе антиферромагнитных интерметаллидов [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Журнал экспериментальной и теоретической физики. - Москва : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 137 № 2. - С. 341-360

Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberian Fed Univ, Krasnoyarsk 660075, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660075, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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15.

Room-temperature ferromagnetism in Dy films doped with Ni / I. . Edelman [et al.] // Physica B. - 2008. - Vol. 403, Is. 18. - P. 3295-3301, DOI 10.1016/j.physb.2008.04.018. - Cited References: 25. - The work was supported partly by the Integration Project of SB RAS (# 3.5), Program "Spintronics" of the Department of Physical Sciences of RAS, and RFBR Grant no. 07-03-00320. . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
METAL NANOSCALE MULTILAYERS
   EARTH
   MAGNETISM
   SURFACE
Кл.слова (ненормированные):
Dy -- Dy-Ni bi-layer films -- magnetic ordering -- magnetic circular dichroism -- magneto-optic Kerr effect -- auger spectroscopy -- Auger spectroscopy -- Dy -- Dy-Ni bi-layer films -- Magnetic circular dichroism -- Magnetic ordering -- Magneto-optic Kerr effect -- Magnetic fields -- Nickel -- Bi layer films -- Magnetic (CE) -- Magneto optical -- Room temperature (RT) ferromagnetism -- Spectral dependences -- Magnetic field effects
Аннотация: Temperature, magnetic field and spectral dependences of magneto-optical effects (MOEs) in bi-layer films Dy(1-x)Nix-Ni and Dy(1-x)(NiFe)(x)-NiFe were investigated, x changes from 0 to 0.06. Peculiar behavior of the MOEs was revealed at temperatures essentially exceeding the Curie temperature of bulk Dy which is explained by the magnetic ordering of the Dy layer containing Ni under the action of two factors: Ni impurities distributed homogeneously over the whole Dy layer and atomic contact of this layer with continues Ni layer. The mechanism of the magnetic ordering is suggested to be associated with the change of the density of states of the alloy Dy(1-x)Nix owing to hybridization with narrow peaks near the Fermi level character for Ni. (C) 2008 Elsevier B.V. All rights reserved.

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Держатели документа:
[Edelman, I.
Ovchinnikov, S.
Markov, V.
Kosyrev, N.
Seredkin, V.
Khudjakov, A.
Bondarenko, G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Ovchinnikov, S.] Siberian Fed Univ, Krasnoyarsk 660074, Russia
[Kesler, V.] Russian Acad Sci, Inst Semicond Phys, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Av. Svobodnyi 71, Krasnoyarsk, 660074, Russian Federation
Institute of Semiconductor Physics, Siberian Division, Russian Academy of Sciences, Av. Akademika Lavrent'eva 13, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Markov, V. V.; Марков, Владимир Витальевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Seredkin, V. A.; Середкин, Виталий Александрович; Khudyakov, A. E.; Bondarenko, G.; Kesler, V.
}
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16.

Commensurate spin density wave in LaFeAsO: A local probe study / H. H. Klauss [et al.] // Phys. Rev. Lett. - 2008. - Vol. 101, Is. 7. - Ст. 77005, DOI 10.1103/PhysRevLett.101.077005. - Cited References: 28 . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
LAYERED QUATERNARY COMPOUND
SUPERCONDUCTIVITY
Кл.слова (ненормированные):
Arsenic compounds -- Chlorine compounds -- Ferromagnetism -- Magnetic materials -- Magnetic properties -- Magnetization -- Magnets -- Molybdenum -- Phase transitions -- Spin density waves -- Commensurate spin density wave -- External fields -- Magnetic orders -- Muon spin relaxations -- Order parameter -- Ordered moments -- Probe measurements -- Ssbauer spectroscopy -- Structural phase transition -- Sublattice magnetizations -- Temperature dependences -- Spin dynamics
Аннотация: We present a detailed study on the magnetic order in the undoped mother compound LaFeAsO of the recently discovered Fe-based superconductor LaFeAsO(1-x)F(x). In particular, we present local probe measurements of the magnetic properties of LaFeAsO by means of (57)Fe Mossbauer spectroscopy and muon-spin relaxation in zero external field along with magnetization and resistivity studies. These experiments prove a commensurate static magnetic order with a strongly reduced ordered moment of 0.25(5)mu(B) at the iron site below T(N)=138 K, well separated from a structural phase transition at T(S)=156 K. The temperature dependence of the sublattice magnetization is determined and compared to theory. Using a four-band spin density wave model both, the size of the order parameter and the quick saturation below T(N) are reproduced.

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Держатели документа:
[Klauss, H. -H.] Tech Univ Dresden, Inst Festkorperphys, D-01069 Dresden, Germany
Amato, A.] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
Buechner, B.] Leibniz Inst Festkorper & Weskstoffforsch IFW, D-01171 Dresden, Germany
Kraken, M.] Tech Univ Carolo Wilhelmina Braunschweig, Inst Phys Kondensierten Mat, D-38106 Braunschweig, Germany
Eremin, I.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Eremin, I.] Tech Univ Carolo Wilhelmina Braunschweig, Inst Math Phys, D-38106 Braunschweig, Germany
Institut fur Festkorperphysik, TU Dresden, D-01069 Dresden, Germany
Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Leibniz-Institut fur Festkorper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany
Institut fur Physik der Kondensierten Materie, TU Braunschweig, D-38106 Braunschweig, Germany
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Institut fur Mathematische Physik, TU Braunschweig, D-38106 Braunschweig, Germany

Доп.точки доступа:
Klauss, H. H.; Luetkens, H.; Klingeler, R.; Hess, C.; Litterst, F. J.; Kraken, M.; Korshunov, M. M.; Коршунов, Максим Михайлович; Eremin, I.; Drechsler, S. L.; Khasanov, R.; Amato, A.; Hamann-Borrero, J. E.; Leps, N.; Kondrat, A.; Behr, G.; Werner, J.; Buchner, B.
}
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17.

Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field / D. A. Balaev [et al.] // Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P. 284-287, DOI 10.1016/j.ssc.2008.05.044. - Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation. . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-STATE
   SUPERCONDUCTORS
   COMPOSITES
   HYSTERESIS
   RESISTANCE
Кл.слова (ненормированные):
superconductors -- flux pinning and creep -- tunneling -- Superconductors -- Flux pinning and creep -- Tunneling -- Agricultural products -- Carbon fiber reinforced plastics -- Copper oxides -- Electric conductivity -- Electric resistance -- Evolutionary algorithms -- Ferromagnetism -- Galvanomagnetic effects -- Grain (agricultural product) -- Health -- Hysteresis -- Magnetic devices -- Magnetic field effects -- Magnetic field measurement -- Magnetic fields -- Magnetic materials -- Magnetoelectronics -- Magnetoresistance -- Semiconductor metal boundaries -- Superconducting magnets -- Superconductivity -- Yttrium barium copper oxides -- p ,p ,t measurements -- Applied (CO) -- Applied magnetic fields -- Constant magnetic field (CMF) -- Elsevier (CO) -- Evolution (CO) -- External fields -- Field induced -- Flux creep -- Hysteretic behavior -- Josephson couplings -- Low magnetic fields -- Magnetic (CE) -- Poly crystalline -- Superconducting grains -- Time evolutions -- time relaxation -- Magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Shaykhutdinov, K. A.
Popkov, S. I.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
}
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18.

Kosyrev, N. N.
Room temperature ferromagnetism of a double-layer Dy1-xNix/Ni structure: in situ magneto-optical measurements / N. N. Kosyrev, S. G. Ovchinnikov // JETP Letters. - 2008. - Vol. 88, Is. 2. - P. 141-143, DOI 10.1134/S0021364008140154. - Cited References: 4. - We are grateful to I.S. Edelman for methodological recommendations and assistance. This work was supported by the Branch of Physical Sciences, Russian Academy of Sciences (2.4.2 "Spintronika" program): the Siberian Branch, Russian Academy of Sciences (3.5 complex integrated project); and the Russian Foundation for Basic Research (project no. 07-03-00320). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

Аннотация: The double-layer Dy1-xNix/Ni structures have been studied in situ an ultrahigh-vacuum chamber by the original technique using the surface meridional Kerr effect directly in the course of deposition. It has been shown that a layer Dy1-xNix alloy is ferromagnetically ordered at room temperature.

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Держатели документа:
[Kosyrev, N. N.
Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Косырев, Николай Николаевич
}
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19.

Nesterov, A. I.
Geometric phases and quantum phase transitions in open systems / A. I. Nesterov, S. G. Ovchinnikov // Phys. Rev. E. - 2008. - Vol. 78, Is. 1. - Ст. 15202, DOI 10.1103/PhysRevE.78.015202. - Cited References: 29 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
POINTS
DEGENERACIES
Кл.слова (ненормированные):
Chlorine compounds -- Electron tunneling -- Ferromagnetism -- Ising model -- Magnetic fields -- Magnetism -- Open systems -- Quantum electronics -- Quantum optics -- Sedimentation -- Effective Hamiltonian -- Eigenvalues -- First orders -- Geometric phase -- Geometric phases -- Ground-state -- Hermitian -- One-dimensional -- Open quantum systems -- Quantum phase transition -- Quantum phase transitions -- Transverse-magnetic fields -- Phase transitions
Аннотация: The relationship is established between quantum phase transitions and complex geometric phases for open quantum systems governed by a non-Hermitian effective Hamiltonian with accidental crossing of the eigenvalues. In particular, the geometric phase associated with the ground state of the one-dimensional dissipative Ising model in a transverse magnetic field is evaluated, and it is demonstrated that the related quantum phase transition is of the first order.

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Держатели документа:
[Nesterov, Alexander I.] Univ Guadalajara, CUCEI, Dept Fis, Guadalajara 44420, Jalisco, Mexico
[Ovchinnikov, S. G.] SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Departamento de Fisica, CUCEI, Universidad de Guadalajara, Av. Revolucion 1500, Guadalajara, Codigo Postal 44420, Jalisco, Mexico
L. V. Kirensky Institute of Physics, SB, RAS, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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20.

Transport properties and ferromagnetism of Co(x)Mn(1-x)Ssulfides / S. S. Aplesnin [et al.] // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 4. - P. 765-772, DOI 10.1134/S1063776108040158. - Cited References: 39 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GIANT VOLUME MAGNETOSTRICTION
   COLOSSAL MAGNETORESISTANCE
   MAGNETIC SEMICONDUCTORS
   ELECTRICAL-PROPERTIES
   ROOM-TEMPERATURE
   ALPHA-MNS
   SPINTRONICS
   TRANSITION
   FEXMN1-XS
   FIELDS
Кл.слова (ненормированные):
Coulomb interactions -- Current voltage characteristics -- Electromotive force -- Ferromagnetism -- Magnetic susceptibility -- Magnetization -- Thermoelectricity -- Transport properties -- Charge susceptibility -- External magnetic fields -- Temperature intervals -- Thermoelectromotive force -- Cobalt compounds
Аннотация: We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80-1000 K, the magnetic susceptibility and magnetization in a temperature range of T= 4.2-300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of CoxMn1 - S-x sulfides (0 <= x <= 0.4). Anomalies in the transport properties of these compounds have been found in the temperature intervals Delta T-1 = 200-270 K and Delta T-2 = 530-670 K and at T-3 similar to T-N. The temperature dependences of the magnetic susceptibility, magnetization, and resistivity, as well as the current-voltage characteristics, exhibit hysteresis. In the domain of magnetic ordering at temperatures below the Neel temperature (TN), the anti ferromagnetic CoxMn1 - xS sulfides possess a spontaneous magnetic moment that is explained using a model of the orbital ordering of electrons in the t(2g) bands. The influence of the cobalt-ion-induced charge ordering on the transport and magnetic properties of sulfides has been studied. The calculated values of the temperatures corresponding to the maxima of charge susceptibility, which are related to a competition between the on-site Coulomb interaction of holes in various subbands and their weak hybridization, agree well with the experimental data.

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Держатели документа:
[Aplesnin, S. S.
Ryabinkina, L. I.
Romanova, O. B.
Velikanov, D. A.
Balaev, A. D.
Balaev, D. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Aplesnin, S. S.
Bandurina, O. N.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Yanushkevich, K. I.
Galyas, A. I.
Demidenko, O. F.] Natl Acad Sci, Joint Inst Solid State & Semicond Phys, Minsk 220072, Byelarus
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Joint Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Romanova, O. B.; Романова, Оксана Борисовна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Yanushkevich, K. I.; Galyas, A. I.; Demidenko, O. F.; Bandurina, O. N.
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