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1.
Magnetization and magnetic
circular dichroism of La0.7Sr0.3MnO3/YSZ polycrystalline films / Y. E. Greben'kova [et al.]> // Phys. Solid State. - 2013. -
Vol. 55
,
Is. 4
. - P. 842-849,
DOI
10.1134/S1063783413040124. - Cited References: 22. - This study was supported by the Russian Foundation for Basic Research (project nos. 11-02-00972 and 12-02-92607). . - 8. - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
MAGNETOOPTICAL PROPERTIES
MANGANITES
Аннотация:
The magnetic and magneto-optical properties as well as the surface morphology and structure of La0.7Sr0.3MnO3 polycrystalline films of different thicknesses have been investigated. It has been shown that films have a rough surface with a characteristic in-plane linear dimension of similar to 30 nm, and crystallites with linear dimensions of 10-20 nm are randomly oriented in the plane. The temperature and field dependences of the magnetization of the films indicate their magnetic inhomogeneity. The magnetic circular dichroism spectra contain a number of bands, one of which at 2.4 eV is explained by the contribution of conduction electrons.
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Публикация на русском языке
Намагниченность и магнитный круговой дихроизм поликристаллических пленок La0.7Sr0.3MnO3/YSZ // Физика твердого тела. - 2013. - Т. 55, Вып. 4. - С. 771-778
Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia
Natl Univ Sci & Technol MISiS, Moscow 119049, Russia;
Доп.точки доступа:
Greben'kova, Yu.E.; Гребенькова, Юлия Эрнестовна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Eremin, E. V.; Еремин, Евгений Владимирович; Edel'man, I. S.; Эдельман, Ирина Самсоновна; Marushchenko, D. A.; Марущенко, Дмитрий Анатольевич; Zaikovskii, V. I.; Chichkov, V. I.; Andreev, N. V.; Mukovskii, Y. M.
}
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2.
Physics, Applied
C94
Cuprates,
manganites
and
cobaltites: Multielectron approach to the band structure / M. M. Korshunov [et al.]> // Mod. Phys. Lett. B. - 2012. -
Vol. 26
,
Is. 24
. - Ст. 1230016,
DOI
10.1142/S0217984912300165. - Cited References: 93. - We are thankful to O. K. Andersen, V. I. Anisimov, A. F. Barabanov, K. I. Kikoin, N. M. Plakida, S. Sakai, A.-M.S. Tremblay, V. V. Val'kov, and R. O. Zaitsev for useful discussions. This work was supported by the Presisium of RAS program Quantum physics of condensed matter N 20.7, Grant "Leading scientific schools of Russia" (NSh 1044-2012.2), RFBR (Grant No. 09-02-00127), Integration Grant of SBRAS-UrBRAS N 44, Grant of President of Russia MK-1683.2010.2, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), and Siberian Federal University (Theme N F-11). M.M.K. and E.I.S. acknowledges support from The Dynasty Foundation and ICFPM. . - ISSN 0217-9849
РУБ
Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
MEAN-FIELD THEORY
DENSITY-FUNCTIONAL FORMALISM
CORRELATED ELECTRON-SYSTEMS
TRANSITION-METAL COMPOUNDS
SPIN-STATE TRANSITION
T-J MODEL
MAGNETIC-PROPERTIES
COPPER OXIDES
LaCoO3
Кл.слова (ненормированные):
LDA plus GTB method
--
strongly-correlated systems
--
band structure
Аннотация:
High-T-c superconductors with CuO2 layers,
manganites
La1-xSrxMnO3 and cobaltites LaCoO3 present several mysteries in their physical properties. Most of them are believed to come from the strongly-correlated nature of these materials. From the theoretical viewpoint, there are many hidden rocks in making the consistent description of the band structure and low-energy physics starting from the Fermi-liquid approach. Here, we discuss the alternative method - multielectron approach to the electronic structure calculations for the Mott insulators - called LDA + GTB (local density approximation + generalized tight-binding) method. Its origin is a straightforward generalization of the Hubbard perturbation theory in the atomic limit and the multiband p - d Hamiltonian with the parameters calculated within LDA. We briefly discuss the method and focus on its applications to cuprates,
manganites
and cobaltites.
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Держатели документа:
[Korshunov, M. M.
Ovchinnikov, S. G.
Shneyder, E. I.
Gavrichkov, V. A.
Orlov, Yu. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.
Ovchinnikov, S. G.
Gavrichkov, V. A.
Orlov, Yu. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Nekrasov, I. A.] Russian Acad Sci, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg 620219, Russian Federation
Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Orlov, Yu.S.; Орлов, Юрий Сергеевич; Nekrasov, I. A.; Pchelkina, Z. V.
}
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3.
Visible magnetic circular
dichroism spectroscopy of the Pr0.8Sr0.2MnO3 and Pr0.6Sr0.4MnO3 thin films / I. S. Edelman [et al.]> // AIP Adv. - 2014. -
Vol. 4
,
Is. 5
. - Ст. 057125,
DOI
10.1063/1.4879818. - Cited References: 30. - The work was supported partly by the Russian Foundation for Basic Researches, grant No’s 14-02-01211, 12-02-00717-a and Grant of the Russian President No Sh-2886.2014.2 . - ISSN 2158-3226
РУБ
Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
MANGANITES
LA1-XSRXMNO3
PEROVSKITES
SPECTRA
Аннотация:
Visiblemagnetic circular dichroism (MCD) in Pr1-xSrxMnO3 with x=0.2 and 0.4was investigated for the first time. Samples for the investigation – polycrystalline films with thickness from 20 to 150 nm were prepared with the dc magnetron sputtering. MCD spectra obtained in the energy interval 1–4 eV at temperatures 100–300 K consist of several maxima with different intensities: very strong one near 3.25–3.4 eV and a broad essentially weaker band near 2 eV. An additional maximum of opposite sign arises in the samples with x = 0.4MCD spectrum at 2.33 eV. Experimental spectra were decomposed to several Gaussian components, and their amplitudes temperature dependences were analyzed. In the case of x = 0.2, all four Gaussian components are characterized by the identical temperature dependence of their amplitudes. In the case of x = 0.4, maxima observed in different spectral intervals demonstrate different temperature dependences of their amplitudes. One more unexpected phenomenon is associated with the different MCD value change in different spectral intervals when coming from x = 0.2 to x = 0.4: high-energy maximum increases more than twice while low-energy maxima intensity stays at that, practically, unchanged.
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Держатели документа:
LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Natl Univ Sci & Technol MISiS, Moscow 119049, Russia
Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Greben'kova, Yu. E.; Гребенькова, Юлия Эрнестовна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Chichkov, V. I.; Andreev, N. V.; Mukovskii, Y.
}
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4.
Dielectric and electrical
properties of polymorphic bismuth pyrostannate Bi2Sn2O7 / L. V. Udod [et al.]> // Phys. Solid State. - 2014. -
Vol. 56
,
Is. 7
. - P. 1315-1319,
DOI
10.1134/S1063783414070336. - Cited References: 20. - This study was supported by the Russian Foundation for Basic Research (project nos. 09-02-00125-a, 14-02-92003 NNS_a, 14-02-90010_Bel_a, and 14-12-00124). . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
STRONG MAGNETIC-FIELD
DOPED
MANGANITES
MAGNETORESISTANCE
Bi2O3
Аннотация:
The Bi2Sn2O7 compound existing simultaneously in two polymorphic modifications, namely, orthorhombic and cubic, has been synthesized for the first time by solid-phase synthesis. The dielectric and electrical properties of the compound have been studied in the temperature range 100 K ˂ T ˂ 500 K. Anomalies in the temperature dependences of the electrical resistivity and the permittivity (imaginary and real parts) have been found at both low and high temperatures. These features are explained in terms of the model of martensitic phase transitions.
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Публикация на русском языке
Диэлектрические и электрические свойства полиморфного пиростаната висмута Bi2Sn2O7 [Текст] / Л. В. Удод [и др.] // Физ. тверд. тела : ФТИ РАН, 2014. - Т. 56 Вып. 7. - С. 1267-1271
Держатели документа:
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Udod, L. V.; Удод, Любовь Викторовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Russian Foundation for Basic Research [09-02-00125-a, 14-02-92003 NNS_a, 14-02-90010_Bel_a, 14-12-00124]
}
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5.
Aplesnin, S. S.
Magnetotransport effects in paramagnetic GdxMn1-xS / S. S. Aplesnin, M. N. Sitnikov> // JETP Letters. - 2014. -
Vol. 100
,
Is. 2
. - P. 95-101,
DOI
10.1134/S0021364014140021. - Cited References: 12. - This work was supported by the Russian Foundation for Basic Research (project nos. 12-02-00125-a and 14-02-90010-Bel_a). . - ISSN 0021-3640. - ISSN 1090-6487
РУБ
Physics, Multidisciplinary
Рубрики:
PHASE-SEPARATION
SPINTRONICS
MANGANITES
Аннотация:
The electrical resistance of GdxMn1 − xS solid solutions with x = 0.1, 0.15, and 0.2 has been measured at magnetic field H = 0.8 T and at zero magnetic field within the 100 K ˂ T ˂ 550 K temperature range. The magnetoresistance peak is observed above room temperature. On heating, the composition with x = 0.2 exhibits the change of magnetoresistance sign from positive to negative and the magnetoresistance peak near the transition to the magnetically ordered state. The experimental data are interpreted in the framework of the model involving the orbital ordering of electrons and the arising electrical polarization leading to the changes in the spectral density of states for electrons in the vicinity of the chemical potential in the applied magnetic field.
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Публикация на русском языке
Аплеснин, Сергей Степанович. Магнитотранспортные эффекты в парамагнитном состоянии в GdxMn1−xS [Текст] / С. С. Аплеснин, М. Н. Ситников // Письма в "Журнал экспериментальной и теоретической физики" : Наука, 2014. - Т. 100 Вып. 1-2. - С. 104-110
Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Доп.точки доступа:
Sitnikov, M. N.; Ситников, Максим Николаевич; Аплеснин, Сергей Степанович; Russian Foundation for Basic Research [12-02-00125-a, 14-02-90010-Bel_a]
}
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6.
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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7.
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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8.
Positive magnetoresistance of
single-crystal bilayer
manganites
(La1−zNdz)1.4Sr1.6Mn2O7 (z = 0, 0.1) / K. A. Shaykhutdinov [et al.]> // J. Appl. Phys. - 2015. -
Vol. 117
,
Is. 16
. - Ст. 163918,
DOI
10.1063/1.4918916. - Cited References:24 . - ISSN 0021. - ISSN 1089-7550. -
РУБ
Physics, Applied
Рубрики:
MAGNETIC PHASE-DIAGRAM
COLOSSAL MAGNETORESISTANCE
LAYERED
MANGANITES
Аннотация:
We investigate magnetoresistance, rho(c), of single-crystal bilayer lanthanum
manganites
(La1-zNdz)(1.4)Sr1.6Mn2O7 (z - 0 and 0.1) at a transport current flowing along the crystal c axis and in external magnetic fields applied parallel to the crystal c axis or ab plane. It is demonstrated that the La1.4Sr1.6Mn2O7 manganite exhibits the positive magnetoresistance effect in the magnetic field applied in the ab sample plane at the temperatures T 60 K, along with the negative magnetoresistance typical of all the substituted lanthanum
manganites
. In the (La0.9Nd0.1)(1.4)Sr1.6Mn2O7 sample, the positive magnetoresistance effect is observed at temperatures of 60-80K in an applied field parallel to the c axis. The mechanism of this effect is shown to be fundamentally different from the colossal magnetoresistance effect typical of lanthanum
manganites
. The positive magnetoresistance originates from spin-dependent tunneling of carriers between the manganese-oxygen bilayers and can be explained by features of the magnetic structure of the investigated compounds. (C) 2015 AIP Publishing LLC.
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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Nikitin, S. E.; Никитин, Станислав Евгеньевич; Petrov, M. I.; Петров, Михаил Иванович; Terent'yev, K. Yu.; Терентьев, Константин Юрьевич; Semenov, S. V.; Семёнов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович
}
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9.
Structural, electrical and
magnetic study of
manganites
Pr0.6Sr0.4MnO3 thin films / D. S. Neznakhin [et al.]> //
J. Phys. Conf. Ser. - 2016. -
Vol. 690
,
Is. 1
,
DOI
10.1088/1742-6596/690/1/012002. - Cited References: 20. - The work was supported partly by RFBR, grant №14-02-01211, Grant of President of Russian Federation №NSh-2886.2014.2, and by The Ministry of Education and Science of the Russian Federation, project №2582. . - ISSN 1742-6588
Перевод заглавия:
Структурные, электрические и магнитные исследования тонких пленок манганита Pr0.6Sr0.4MnO3
Кл.слова (ненормированные):
Magnetic materials
--
Magnetization
--
Manganese oxide
--
Nanoelectronics
--
Nanostructures
--
Oxide films
--
Field dependence
--
Magnetization temperature curves
--
Polycrystalline phase
--
Polycrystalline pr
--
Resistivity dependence
--
Shape characteristics
--
Structural parameter
--
Zero-field cooling
--
Thin films
Аннотация:
Thin polycrystalline Pr0.6Sr0.4MnO3 films were grown on the Y stabilized zirconium oxide substrates by magnetron sputtering using RF power and off-axis sputtering scheme with double cathodes. Only one polycrystalline phase with structural parameters consistent with that for the corresponding bulk sample was revealed in the films. Electric resistivity dependence on temperature demonstrates the shape characteristic for the substances with the Mott transition. The difference between magnetization temperature curves measured in the zero field cooling and field cooling modes was revealed. Magnetization field dependences were presented by the hysteresis loops changing their form with temperature. © Published under licence by IOP Publishing Ltd.
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Доп.точки доступа:
Neznakhin, D. S.; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Semenov, S. V.; Семёнов, Сергей Васильевич; Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics(St. Petersburg)(17 ; 23 - 27 Nov. 2015)
}
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10.
Current-voltage characteristics of
polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3 at low temperatures / K. A. Shaikhutdinov [et al.]> // Phys. Solid State. - 2011. -
Vol. 53
,
Is. 12
. - P. 2455-2458,
DOI
10.1134/S1063783411120213. - Cited References: 16. - This study was supported in part by the Siberian Branch of the Russian Academy of Sciences (within the framework of the Lavrent'ev Competition of Young Scientists' Projects (project no. 12). . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
MANGANITES
Аннотация:
The current-voltage characteristics of the polycrystalline substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 have been measured at temperatures close to the metal-insulator transition temperature and at low temperatures. In both cases, the current-voltage characteristics exhibit nonlinear properties that are strongly dependent on the strength of an applied magnetic field. The mechanisms responsible for the nonlinear properties at these temperatures are found to be different: near the metal-insulator transition, the current-voltage characteristics are determined by the phase layering inside granules, while at low temperatures, they are determined by tunneling of carriers through insulating interlayers of the granules.
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Держатели документа:
[Shaikhutdinov, K. A.
Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Sapronova, N. V.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Semenov, S. V.; Семенов, Сергей Васильевич; Sapronova, N. V.; Volkov, N. V.; Волков, Никита Валентинович
}
Найти похожие
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
}
Найти похожие
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.
Magnetoresistance of substituted
lanthanum
manganites
La0.7Ca0.3MnO3 upon nonequilibrium overheating of carriers / K. A. Shaykhutdinov [et al.]> // J. Appl. Phys. - 2011. -
Vol. 109
,
Is. 8
. - Ст. 83711,
DOI
10.1063/1.3573666. - Cited References: 15. - This study was partially supported by the Russian Foundation for Basic Research, project no. 08-02-00259a, and the Lavrent'ev's Competition of Young Scientists of the Siberian Branch of the RAS, project no. 12. . - ISSN 0021-8979
РУБ
Physics, Applied
Кл.слова (ненормированные):
Field dependence
--
Lanthanum
manganites
--
Low thermal conductivity
--
Manganite materials
--
Negative differential resistivity
--
Non equilibrium
--
Non-Linearity
--
Nonequilibrium heating
--
Polycrystalline
--
Positive magnetoresistance
--
Transport currents
--
Electric resistance
--
Electron gas
--
Heating
--
Lanthanum
--
Lanthanum alloys
--
Magnetic fields
--
Magnetoelectronics
--
Magnetoresistance
--
Manganese oxide
--
Manganites
--
Thermal conductivity
--
Current voltage characteristics
Аннотация:
Current-voltage characteristics of the polycrystalline substituted lanthanum manganite La0.7Ca0.3MnO3 were experimentally studied at T - 77.4 K in magnetic fields up to 13 kOe. In these characteristics, a portion of negative differential resistivity was observed above a certain threshold value of critical current density j caused, in our opinion, by nonequilibrium heating of the electron gas due to low thermal conductivity of the manganite material. Because of the nonlinearity of the current-voltage characteristics, the field dependences of resistivity rho( H) appear extremely sensitive to the value of a transport current. In this case, the rho( H) dependences reveal both ordinary negative and positive magnetoresistance. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3573666]
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Держатели документа:
[Shaykhutdinov, K. A.
Semenov, S. V.
Popkov, S. I.
Balaev, D. A.
Bykov, A. A.
Dubrovskiy, A. A.
Petrov, M. I.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shaykhutdinov, K. A.
Popkov, S. I.
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; Semenov, S. V.; Семенов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Bykov, A. A.; Быков, Алексей Анатольевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Petrov, M. I.; Петров, Михаил Иванович; Volkov, N. V.; Волков, Никита Валентинович
}
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14.
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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15.
Non-linear current-voltage characteristics
of (La0.5Eu0.5)(0.7)Pb0.3MnO3 single crystals: Possible manifestation of the internal heating of charge carriers / K. A. Shaykhutdinov [et al.]> // Physica B. - 2010. -
Vol. 405
,
Is. 24
. - P. 4961-4965,
DOI
10.1016/j.physb.2010.09.043. - Cited References: 19. - The authors are grateful to A.N. Lavrov for useful discussions on the results. This study was partially supported by the Russian Foundation for Basic Research, Project no. 08-02-00259a and the Lavrent'ev Young Scientists' Competition of the Siberian Branch of the Russian Academy of Sciences. Project no. 12. . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
INSULATOR-METAL TRANSITION
PR0.7CA0.3MNO3
MANGANITES
Кл.слова (ненормированные):
Manganites
--
Negative differential resistance
--
CVC
--
CVC
--
Manganites
--
Negative differential resistance
--
Applied electric field
--
Charge ordering
--
Current switching
--
CVC
--
Dielectric regions
--
Experimental data
--
Internal heating
--
Lanthanum
manganites
--
Metal-dielectric transition
--
Negative differential resistances
--
Non equilibrium
--
Non-linear
--
Sample heating
--
Temperature evolution
--
Transport currents
--
Electric fields
--
Electron gas
--
Europium
--
Heating
--
Lanthanum
--
Lead
--
Manganites
--
Negative resistance
--
Phase separation
--
Single crystals
--
Thermal conductivity
--
Manganese oxide
Аннотация:
Temperature evolution of the current-voltage characteristics (CVCs) of a single-crystal lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 is investigated in a wide (up to 1 A) range of instrumental currents. Effects of a transport current and an applied electric field on the resistance of the material are studied in view of possible implementation of the charge ordering break in dielectric regions occurring due to phase separation in
manganites
. A negative differential resistance portion observed in the CVCs suggests the presence of a current switching effect. Below the temperature of the metal-dielectric transition in (La0.5Eu0.5)(0.7)Pb0.3MnO3, the hysteresis is observed in the CVC. The detailed analysis of the internal sample heating on the basis of experimental data on thermal conductivity showed, however, that these CVC features can be explained within the concept of non-equilibrium heating of electron gas. (C) 2010 Elsevier B.V. All rights reserved.
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Держатели документа:
[Shaykhutdinov, K. A.
Popkov, S. I.
Balaev, D. A.
Semenov, S. V.
Bykov, A. A.
Dubrovskiy, A. A.
Sapronova, N. V.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shaykhutdinov, K. A.
Popkov, S. I.
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; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семенов, Сергей Васильевич; Bykov, A. A.; Быков, Алексей Анатольевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Sapronova, N. V.; Volkov, N. V.; Волков, Никита Валентинович
}
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16.
Adiabatic calorimetric study
of the intense magnetocaloric effect and the heat capacity of (La(0.4)Eu(0.6))(0.7)Pb(0.3)MnO(3) / A. V. Kartashev [et al.]> // Phys. Solid State. - 2008. -
Vol. 50
,
Is. 11
. - P. 2115-2120,
DOI
10.1134/S1063783408110188. - Cited References: 15. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-1011.2008.2) and the Siberian Branch of the Russian Academy of Sciences ( Lavrent'ev Competition of Young Scientists Projects, grant no. 51) within the framework of the Integration Project no. 3.7 of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
LA0.7CA0.3MNO3
MANGANITES
Кл.слова (ненормированные):
75
--
30
--
Sg
--
75
--
40
--
Cx
Аннотация:
The temperature dependences of the intense magnetocaloric effect T (AD)(T, H) and the heat capacity C (p) (T) of the (La(0.4)Eu(0.6))(0.7)Pb(0.3)MnO(3) manganite are directly measured using adiabatic calorimetry. The experimental dependences T (AD)(T) are in satisfactory agreement with those calculated from the data on the behavior of the magnetization. The factors responsible for the absence of an anomaly in the experimental temperature dependence of the heat capacity C (p) (T) in the range of the magnetic phase transition are discussed.
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Держатели документа:
[Kartashev, A. V.
Flerov, I. N.
Volkov, N. V.
Sablina, K. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Flerov, I. N.
Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660079, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660079, Russian Federation
Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Volkov, N. V.; Волков, Никита Валентинович; Sablina, K. A.; Саблина, Клара Александровна
}
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17.
The magnetic-field-driven effect
of microwave detection in a manganite granular system / N. V. Volkov [et al.]> // J. Phys. D. - 2008. -
Vol. 41
,
Is. 1
. - Ст. 15004,
DOI
10.1088/0022-3727/41/1/015004. - Cited References: 24 . - ISSN 0022-3727
РУБ
Physics, Applied
Рубрики:
IDENTICAL METALS
TUNNEL-JUNCTIONS
MAGNETORESISTANCE
RECTIFICATION
SPINTRONICS
TEMPERATURE
PEROVSKITES
Кл.слова (ненормированные):
Bias currents
--
Curie temperature
--
Electric power generation
--
Granular materials
--
Magnetic field effects
--
Microwave irradiation
--
Voltage measurement
--
Direct current voltage
--
Magnetic tunnel junctions
--
Metal insulator metal junctions
--
Nonmagnetic metals
--
Manganites
Аннотация:
We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal junctions with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic tunnel junctions and spin dynamics of the grains, which form these junctions in the sample.
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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Shaykhutdinov, K. A.
Tsikalov, V. S.
Petrov, M. I.
Balaev, D. A.
Semenov, S. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Volkov, N. V.] 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:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Tsikalov, V. S.; Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семенов, Сергей Васильевич
}
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18.
Zinenko, V. I.
Lattice dynamics and the phase transition from the cubic phase to the tetragonal phase in the LaMnO3 crystal within the polarizable-ion model / V. I. Zinenko, M. S. Pavlovskii> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 9
. - P. 1749-1758,
DOI
10.1134/S1063783407090235. - Cited References: 23 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
NEUTRON-DIFFRACTION
PEROVSKITES
MANGANITES
PHONONS
Аннотация:
The paper reports on the results of ab initio calculations of the static and dynamic properties of the LaMnO3 crystal with a perovskite structure in the cubic, rhombohedral, and orthorhombic phases. The calculations are performed within the ionic crystal model, which takes into account the deformability and polarizability of the ions. It is revealed that the spectrum of lattice vibrations in the cubic phase contains unstable vibrational modes, which occupy the phase space in the entire Brillouin zone. The eigenvectors of the softest mode at the boundary point R of the Brillouin zone are associated with the displacements of the oxygen ions and correspond to the "rotation" of the MnO6 octahedron. The condensation of one, two, and three components of this mode leads to the tetragonal, orthorhombic, and rhombohedral distortions of the structure. The structural phase transition is described in terms of the local mode approximation with the use of the double perovskite unit cell, in which the MnO6 octahedron is explicitly separated. The parameters of the model Hamiltonian are determined. The static properties are investigated by the Monte Carlo method. The calculated temperature of the phase transition from the cubic phase (9800 K) is considerably higher than the melting temperature of the crystal under investigation. The calculated frequencies of long-wavelength lattice vibrations in the experimentally observed orthorhombic and rhombohedral phases are in reasonable agreement with experimental data.
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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Pavlovskii, M. S.; Павловский, Максим Сергеевич; Зиненко, Виктор Иванович
}
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19.
Aplesnin, S. S.
Effect of bond fluctuations on the transport properties of
manganites
and nickelates / S. S. Aplesnin> // J. Exp. Theor. Phys. - 2007. -
Vol. 104
,
Is. 5
. - P. 766-774,
DOI
10.1134/S1063776107050111. - Cited References: 26 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
NEUTRON-DIFFRACTION
CHARGE DISPROPORTIONATION
ELECTRONIC-STRUCTURE
MAGNETIC ORDER
TRANSITIONS
PEROVSKITES
PRNIO3
GAP
Кл.слова (ненормированные):
Crystal structure
--
Manganites
--
Optimization
--
Thermal conductivity
--
Thermal effects
--
Bond fluctuations
--
Nickelates
--
Orthorhombic crystal structure
--
Nickel compounds
Аннотация:
For the
manganites
RMnO(3) (R = La, Pr, Nd), a mechanism is proposed to explain the anomalous temperature dependences of the kinetic coefficients, resistivity, and thermoelectric power during the transition from the pseudocubic O to the orthorhombic O' crystal structure. The contributions of the bending and stretching modes of the octahedron to the formation of thermal-conductivity maxima and to the deviation from the linear dependence of ln(rho/T) on 1/T at low temperatures have been estimated. In nickelates, the metal-insulator transition is caused by lattice-polaron pinning by the stretching mode of the octahedron, and the low-temperature anomaly of the thermal conductivity is related to electron scattering by the bending mode of the octahedron.
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Публикация на русском языке
Аплеснин, Сергей Степанович. Роль флуктуации связей на транспортные свойства в магнганитах и никелатах [Текст] / С. С. Аплеснин // Журн. эксперим. и теор. физ. - 2007. - Т. 131 № 5. - С. 878-888
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation
Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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20.
Aplesnin, S. S.
Influence of the four-spin exchange interaction on the magnetic properties of
manganites
/ S. S. Aplesnin, N. I. Piskunova> // J. Phys.: Condens. Matter. - 2005. -
Vol. 17
,
Is. 37
. - P. 5881-5888,
DOI
10.1088/0953-8984/17/37/023. - Cited References: 18 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
PHASE
SUSCEPTIBILITY
LA1-XSRXMNO3
FERROMAGNET
TRANSPORT
Кл.слова (ненормированные):
Computer simulation
--
Ion exchange
--
Lanthanum compounds
--
Magnetic properties
--
Monte Carlo methods
--
Phase diagrams
--
Phase transitions
--
Four-spin exchange interaction
--
Magnetic phase diagram
--
Manganites
--
Metal-dielectric transition
--
Manganese compounds
Аннотация:
It is shown that non-Heisenberg exchange interaction should be taken into account to reproduce the magnetic phase diagram of La(1-x)A(x)MnO(3) (A = Ca, Sr) using only effective exchange parameters and spins. The formation of the four-spin exchange arises from carrier hopping and coincides with the critical concentration metal-dielectric transition. The two- and four-spin exchange parameters are determined by Monte Carlo simulations.
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Держатели документа:
MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660036, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
M F Reshetneva Aircosmic Siberian State University, Krasnoyarsk 660036, Russian Federation
L V Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Science, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Piskunova, N. I.; Аплеснин, Сергей Степанович
}
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