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1.
Intrinsic inhomogeneity in
a (La0.4Eu0.6)(0.7)Pb0.3MnO3 single crystal: Magnetization, transport, and electron magnetic resonance studies / N. . Volkov [et al.]> // Phys. Rev. B. - 2006. -
Vol. 73
,
Is. 10
. - Ст. 104401,
DOI
10.1103/PhysRevB.73.104401. - Cited References: 29 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
INSULATOR-METAL TRANSITION
PHASE-SEPARATION
MAGNETORESISTANCE
MANGANITES
EXCHANGE
STATE
Аннотация:
Conventional magnetic and transport measurements of the melt-grown mixed-valence manganite (La0.4Eu0.6)(0.7)Pb0.3MnO3 have been supplemented by a magnetic resonance study. The experimental data support the model of two magnetic phases coexisting in the crystal volume. At a temperature T-*, which is well above Curie temperature T-C, ferromagnetic clusters appear in the sample. These ferromagnetic regions possess a higher conductivity in comparison with the paramagnetic background (majority phase). On cooling through T-C, the magnetization of the spatially confined ferromagnetic clusters of the minority phase freezes in random directions with respect to the magnetization of the ferromagnetic majority phase due to the difference of the
exchange
interactions at the phase boundaries from the intraphase interactions in sign and value. Such a mixed state is responsible for the observed magnetic glassylike behavior of the system that is characteristic of inhomogeneous magnets. The fluctuations of the magnetic coupling value and sign in the sample volume are related to strong competition between the ferromagnetic and antiferromagnetic
exchange
interactions, which, in turn, results from the quenched disorder caused by the random chemical replacement of the perovskite A site of the manganite. A phase-separation state comprised of two different ferromagnetic phases has been used to account for the colossal magnetoresistance phenomenon and the magnetic-field-driven nonlinear conduction found in the crystal.
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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Tech Univ Munich, Phys Dept E21, D-85747 Garching, Germany
ИФ СО РАН
L. V. Kirensky Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
Physics-Department E21, Technical University of Munich, D-85747 Garching, Germany
Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Patrin, K. G.; Патрин, Константин Геннадьевич; Sablina, K. A.; Саблина, Клара Александровна; Eremin, E. V.; Еремин, Евгений Владимирович; Vasiliev, V.; Vasiliev, A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Boni, P.; Clementyev, E.
}
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2.
Size effects and
magnetization of (Fe/Si)(n) multilayer film nanostructures / S. N. Varnakov [et al.]> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 8
. - P. 1470-1475,
DOI
10.1134/S1063783407080124. - Cited References: 36 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
GIANT MAGNETORESISTANCE
FE/SI MULTILAYERS
ULTRAHIGH-VACUUM
SUPERLATTICES
EXCHANGE
RESONANCE
LAYER
Аннотация:
The temperature dependence of the magnetization of (Fe/Si) (n) multilayer films with nanometer layers is investigated. The films are prepared through thermal evaporation under ultrahigh vacuum onto Si(100) and Si(111) single-crystal substrates. It is revealed that the thickness of individual iron layers in (Fe/Si) (n) multilayer films affects the magnetization and its temperature dependence. The inference is made that this dependence is associated with the formation of a chemical interface at the Fe-Si boundaries. The characteristics of the chemical interface in the (Fe/Si) (n) films are estimated.
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Публикация на русском языке
Размерные эффекты и намагниченность многослойных пленочных наноструктур (Fe/Si)[n] [Текст] / С. Н. Варнаков [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 8. - С. 1401-1405
Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Airospace Univ, Krasnoyarsk 660014, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Zaragoza 50009, Spain
Univ Zaragoza, Inst Nanociencia Aragon, Zaragoza 50009, Spain
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok Krasnoyarsk 660036, Russian Federation
Siberian Airospace University, pr. im. gazety Krasnoyarskii R. 31, Krasnoyarsk 660014, Russian Federation
Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
Instituto de Nanociencia de Aragon, Universidad de Zaragoza, Zaragoza 50009, Spain
Доп.точки доступа:
Varnakov, S. N.; Варнаков, Сергей Николаевич; Bartolome, J.; Sese, J.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Parshin, A. S.; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич; Borovik-Romanova, O. \пер.\
}
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3.
Magnetic properties of
Fe3C ferromagnetic nanoparticles encapsulated in carbon nanotubes / S. V. Komogortsev [et al.]> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 4
. - P. 734-738,
DOI
10.1134/S1063783407040233. - Cited References: 15 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
IRON NANOPARTICLES
EXCHANGE
SYSTEM
Аннотация:
The low-temperature dependences of magnetic characteristics (namely, the coercive force H (c) , the remanent magnetization M (r) , local magnetic anisotropy fields H (a), and the saturation magnetization M (s) ) determined from the irreversible and reversible parts of the magnetization curves for Fe3C ferromagnetic nanoparticles encapsulated in carbon nanotubes are investigated experimentally. The behavior of the temperature dependences of the coercive force H (c) (T) and the remanent magnetization M (r) (T) indicates a single-domain structure of the particles under study and makes it possible to estimate their blocking temperature T (B) = 420-450 K. It is found that the saturation magnetization M (s) and the local magnetic anisotropy field H-a vary with temperature as similar to T-5/2.
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Публикация на русском языке
Комаров С. А. Характеристики согласования и взаимной связи элементов конечной волноводной решетки с импедансным фланцем [Текст] / Комаров С.А., Щербинин В.В. // Радиотехника и электроника. - 2007. - Т. 52 № 7. - С. 773-780
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Div, Novosibirsk 660090, Russia
Krasnoyarsk State Pedag Univ, Krasnoyarsk 660017, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, ul. Akademika Lavrent'eva 3, Novosibirsk, 660090, Russian Federation
Krasnoyarsk State Pedagogical University, ul. Lebedevoy 79, Krasnoyarsk, 660017, Russian Federation
Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Balaev, A. D.; Балаев, Александр Дмитриевич; Kudashov, A. G.; Okotrub, A. V.; Smirnov, S. I.
}
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4.
Magnetic properties and
nonmagnetic phases formation in (Fe/Si)(n) films / S. N. Varnakov [et al.]> // J. Appl. Phys. - 2008. -
Vol. 104
,
Is. 9
. - Ст. 94703,
DOI
10.1063/1.3005973. - Cited References: 23. - This work was supported by the Russian Academy of Science program "Spintronics," the complex integration project of the Siberian Branch of the Russian Academy of Science. 3.5, the Russian Foundation for Basic Research (Grant No. 07-03-00320), the "Ramon y Cajal" program, and Project No. MAT 2005/01272 of the Spanish Ministry of Education and Science. . - ISSN 0021-8979
РУБ
Physics, Applied
Рубрики:
FE/SI/FE TRILAYER FILMS
GIANT MAGNETORESISTANCE
ULTRAHIGH-VACUUM
SUPERLATTICES
MULTILAYERS
EXCHANGE
Кл.слова (ненормированные):
Activation energy
--
Integral equations
--
Magnetic properties
--
Magnetization
--
Magnets
--
Multilayers
--
Rate constants
--
Silicon
--
Thermal evaporation
--
Vacuum
--
Vacuum evaporation
--
Fe layers
--
High temperatures
--
Interface layers
--
Irreversible behaviors
--
Kinetic equations
--
N films
--
Nonmagnetic
--
Nonmagnetic phases
--
Prefactor
--
Quantitative analysis
--
Rate equations
--
Synthetic procedures
--
Temperature dependences
--
Ultrahigh-vacuum systems
--
Phase interfaces
Аннотация:
The magnetization of Fe/Si multilayers, grown by thermal evaporation in an ultrahigh vacuum system, was investigated at high temperatures. Magnetization and its temperature dependence up to a high temperature of 800 K depend on individual Fe layer thickness d(Fe). This dependence is the result of the formation of an Fe-Si interface layer (nonmagnetic phase) during the synthetic procedure. The fraction of this Fe-Si nonmagnetic phase is estimated versus dFe. At temperatures higher than 400 K an irreversible decrease in the magnetization occurs. A quantitative analysis of this irreversible behavior is proposed in terms of an exponential diffusion-like kinetic equation for the reaction that produces the Fe-Si nonmagnetic phase. The coefficients of the rate equation are the activation energy E(a) and the prefactor D(0), which have been determined for different d(Fe). (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3005973]
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Держатели документа:
[Varnakov, S. N.
Komogortsev, S. V.
Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
[Varnakov, S. N.] Siberian Aerosp Univ, Krasnoyarsk 660014, Russia
[Bartolome, J.] Univ Zaragoza, Inst Ciencia Mat Aragon, Dept Fis Mat Condensada, CSIC, E-50009 Zaragoza, Spain
[Sese, J.] Univ Zaragoza, Inst Nanociencia Aragon, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Aerospace University, pr. im. gazety Krasnoyarskii rabochii 31, Krasnoyarsk 660014, Russian Federation
Instituto de Ciencia de Materiales de Aragon, Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
Instituto de Nanociencia de Aragon, Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
Доп.точки доступа:
Varnakov, S. N.; Варнаков, Сергей Николаевич; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Bartolome, J.; Sese, J.
}
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5.
Electronic structure of
grain boundaries in the Fe-86-Mn-12.7-C(1.3)alloy / A. V. Nyavro [et al.]> // Russ. Phys. J. - 2008. -
Vol. 51
,
Is. 9
. - P. 973-979,
DOI
10.1007/s11182-009-9127-5. - Cited References: 13 . - ISSN 1064-8887
РУБ
Physics, Multidisciplinary
Рубрики:
FERROMAGNETIC IRON
EXCHANGE
Аннотация:
The importance of studying Fe-Mn-C alloys is related to their wide use as constructional materials in mechanical engineering. In this work an effort has been made to elucidate the physical origin of the magnetization in austenitic steels by calculating the electronic structure of grain boundaries. To theoretically investigate the magnetic properties of a crystal of ferromagnetic bcc iron, the wave functions of the iron atom calculated in view of the spin polarization of a core by the Hartree-Fock method with local
exchange
-correlation potentials have been used as base functions. This has made it possible to optimize the choice of a zero approximation for the description of the electronic states of ferromagnetic iron and to attain good agreement with the experimental values of the magnetic moment (A mu(theor) = 2.23A mu(B), A mu(exp) = 2.218A mu(B)), of the
exchange
splitting of the crystal term P-4 (Delta(theor) = Delta(exp) = 0.112 Ry), and of the cross-sections of the Fermi surface. A similar approach has been used to investigate the magnetic states of clusters (nanoclusters) based on the method of scattered waves. The approach developed for clusters of the alloy under investigation makes it possible to calculate the alloy magnetic properties in relation to the cluster size for a varied lattice parameter.
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Держатели документа:
[Nyavro, A. V.
Cherepanov, V. N.] Tomsk VV Kuibyshev State Univ, Tomsk 634050, Russia
[Musikhin, V. A.] Siberian Fed Univ, Krasnoyarsk, Russia
[Arkhipkin, V. G.] Russian Acad Sci, LV Kirenskii Phys Inst, Siberian Branch, Krasnoyarsk, Russia
[Kveglis, L. I.] E Kazakhstan Tech Univ, Ust Kamenogorsk, Kazakhstan
ИФ СО РАН
Tomsk State University, Tomsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
L. V. Kirenskii Physics Institute, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
East-Kazakhstan Technical University, Ust Kamenogorsk, Kazakhstan
Доп.точки доступа:
Nyavro, A. V.; Cherepanov, V. N.; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Kveglis, L. I.; Musikhin, V. A.
}
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6.
Atypical quantum confinement
effect in silicon nanowires / P. B. Sorokin [et al.]> // J. Phys. Chem. A. - 2008. -
Vol. 112
,
Is. 40
. - P9955-9964,
DOI
10.1021/jp805069b. - Cited Reference Count: 25. - Гранты: This work was in part partially supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Technology Agency (JST) as well as by Russian Fund of Basic Researches (grant 08-02-01096) (L.A.C.). P.V.A. acknowledges the encouragement of Dr. Keiji Morokuma, Research Leader at Fukui Institute for Fundamental Chemistry. The geometry of all presented structures was visualized by ChemCraft software.SUP25/SUP L.A.C. acknowledges I. V. Stankevich for help and fruitful discussions. P.B.S. is grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for access to a cluster computer for quantum-chemical calculations. - Финансирующая организация: Japan Science and Technology Agency (JST); Russian Fund of Basic Researches [08-02-01096] . - OCT 9. - ISSN 1089-5639
Рубрики:
ELECTRONIC-STRUCTURE
OPTICAL-PROPERTIES
SI
DENSITY
WIRES
EXCHANGE
ATOMS
DOTS
Кл.слова (ненормированные):
Electric wire
--
Energy gap
--
Gallium alloys
--
Mathematical models
--
Nanostructured materials
--
Nanostructures
--
Nanowires
--
Quantum confinement
--
Quantum electronics
--
Semiconductor quantum dots
--
Silicon
--
Ami methods
--
Band gaps
--
Blue shifts
--
Dinger equations
--
Linear junctions
--
Monotonic decreases
--
Quantum confinement effects
--
Quantum dots
--
Semiempirical
--
Silicon nanowires
--
System sizes
--
Theoretical models
--
Nanocrystalline silicon
--
nanowire
--
quantum dot
--
silicon
--
article
--
chemistry
--
electron
--
quantum theory
--
Electrons
--
Nanowires
--
Quantum Dots
--
Quantum Theory
--
Silicon
Аннотация:
The quantum confinement effect (QCE) of linear junctions of silicon icosahedral quantum dots (IQD) and pentagonal nanowires (PNW) was studied using DFT and semiempirical AM1 methods. The formation of complex IQD/PNW structures leads to the localization of the HOMO and LUMO on different parts of the system and to a pronounced blue shift of the band gap; the typical QCE with a monotonic decrease of the band gap upon the system size breaks down. A simple one-electron one-dimensional Schrodinger equation model is proposed for the description and explanation of the unconventional quantum confinement behavior of silicon IQD/PNW systems. On the basis of the theoretical models, the experimentally discovered deviations from the typical QCE for nanocrystalline silicon are explained.
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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
LV Kirenskii Inst Phys, SB RAS, Krasnoyarsk 660036, Russia
RAS, N M Emanuel Inst Biochem Phys, Moscow 119334, Russia
Kyoto Univ, Fukui Inst Fundamental Chem, Kyoto 6068103, Japan
Natl Inst Adv Ind Sci & Technol, Res Inst Computat Sci, Tsukuba, Ibaraki 3058568, Japan
Доп.точки доступа:
Sorokin, P. B.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Avramov, P. V.; Chernozatonskii, L.A.; Fedorov, D.G.
}
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7.
Shneyder, E. I.
Isotope effect in the model of strongly correlated electrons with the magnetic and phonon superconducting pairing mechanisms / E. I. Shneyder, S. G. Ovchinnikov> // J. Exp. Theor. Phys. - 2009. -
Vol. 109
,
Is. 6
. - P. 1017-1021,
DOI
10.1134/S1063776109120139. - Cited References: 42. - This study was financed under programs 5.7 and "Quantum Physics of Condensed Matter" of the Presidium of the Russian Academy of Sciences, integration project no. 40 of the Siberian Branch and Ural Division of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 09-02-00127). . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
CUPRATE SUPERCONDUCTORS
PHASE-TRANSITIONS
3-CENTER INTERACTIONS
HUBBARD-MODEL
TEMPERATURE
LA2-XSRXCUO4
SYMMETRY
EXCHANGE
COPPER
BI2SR2CACU2O8+DELTA
Кл.слова (ненормированные):
Ab initio calculations
--
Calculated values
--
Cooper pairing
--
Isotope effect
--
Magnetic mechanisms
--
Order of magnitude
--
Pairing mechanism
--
Phonon mechanism
--
Strongly correlated electrons
--
Superconducting pairing mechanism
--
Superconducting state
--
Type theory
--
Carrier mobility
--
Electron-phonon interactions
--
Isotopes
--
Superconductivity
--
Superconducting magnets
Аннотация:
Peculiarities of the temperature isotope effect in a BCS-type theory describing the
exchange
and phonon mechanisms of Cooper pairing in a system of strongly correlated electrons are considered. The electron-phonon interaction constant is determined from the fitting of the calculated value of the isotope-effect index to the observed value with the parameters of La(2 - x) Sr (x) CuO(4) obtained from ab initio calculations. The value of this constant indicates that the contribution from the traditional pairing mechanism to the superconducting state is of the same order of magnitude as the contribution from the magnetic mechanism.
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Публикация на русском языке
Шнейдер, Елена Игоревна. Изотопический эффект в модели сильно коррелированных электронов, учитывающей магнитный и фононный механизмы сверхпроводящего спаривания [Текст] / Е. И. Шнейдер, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2009. - Т. 136 Вып. 6. - С. 1177-1182
Держатели документа:
[Shneyder, E. I.
Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shneyder, E. I.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Шнейдер, Елена Игоревна; Presidium of the Russian Academy of Sciences [40]; Russian Academy of Sciences; Russian Foundation for Basic Research [09-02-00127]
}
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8.
Atomic Structure and
Energetic Stability of Complex Chiral Silicon Nanowires / P. V. Avramov [et al.]> // J. Phys. Chem. C. - 2010. -
Vol. 114
,
Is. 35
. - P. 14692-14696,
DOI
10.1021/jp1016399. - Cited Reference Count: 36. - Гранты: This work was supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Technology Agency (JST) and a collaborative RFBR-JSPS grant No. 09-02-92107-Phi. S.I. also acknowledges support by the Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology (SCF) commissioned by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. L.Ch. acknowledges support by the Presidium of Russian Academy of Sciences (Program No. 27). - Финансирующая организация: CREST (Core Research for Evolutional Science and Technology); Japan Science and Technology Agency (JST); RFBR-JSPS [09-02-92107]; Special Coordination Funds for Promoting Science and Technology (SCF); Presidium of Russian Academy of Sciences [27] . - SEP 9. - ISSN 1932-7447
Рубрики:
DENSITY-FUNCTIONAL METHODS
GROWTH
EXCHANGE
NANOHELICES
NANOSPRINGS
Кл.слова (ненормированные):
Ab initio
--
Atomic structure
--
Chiral complexes
--
Consecutive shifts
--
DFT method
--
Energetic stability
--
HOMO-LUMO gaps
--
Metastable structures
--
Potential barriers
--
Si atoms
--
Silicon Nanowires
--
Unit cell parameters
--
Atoms
--
Chirality
--
Electronic structure
--
Enantiomers
--
Metastable phases
--
Nanowires
--
Stereochemistry
--
Wire
--
Crystal atomic structure
Аннотация:
Atomic and electronic structure and energetic stability of newly proposed pentagonal and hexagonal chiral complex silicon nanowires (NWs) composed of five or six (I 10) oriented crystalline fragments were studied using the ab initio DFT method. The chirality of the wires was caused by consecutive shifts of each fragment by 1/5 or 1/6 of the wire unit cell parameter and rotations of 4 degrees and 3.3 degrees for achiral pentagonal or hexagonal wires, respectively. Chirality causes the HOMO-LUMO gap to reduce by 0.1 eV. Chiral silicon nanowires are found to be metastable structures with a 4,5 (kcal/mol)/Si atom potential barrier for reversible chiral achiral transformation.
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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Kyoto Univ, Fukui Inst Fundamental Chem, Sakyo Ku, Kyoto 6068103, Japan
Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648602, Japan
Nagoya Univ, Dept Chem, Nagoya, Aichi 4648602, Japan
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Minami, S.; Morokuma, K.; Irle, S.; Chernozatonskii, L.A.
}
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9.
Effect of alloy
formation processes in the Co-Cu system on the magnetic and magnetoresistance properties of multilayer Co/Cu films with ultrathin Co layers prepared by DC magnetron sputtering / D. L. Khalyapin [et al.]> // Phys. Solid State. - 2010. -
Vol. 52
,
Is. 9
. - P. 1787-1796,
DOI
10.1134/S1063783410090015. - Cited References: 29 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
GIANT MAGNETORESISTANCE
SIZE DISTRIBUTION
SPIN VALVES
EXCHANGE
TEMPERATURE
HYSTERESIS
ANISOTROPY
CU(001)
ISLANDS
Аннотация:
This paper reports on a study of multilayer Co/Cu films with an effective thickness of the Co layer of similar to 3.5 , which were prepared by magnetron sputtering. The samples prepared have been found to have a metastable multiphase structure. An analysis of the data obtained by structural and, primarily, by magnetic methods has revealed that the main phases are the Co/Cu supersaturated solid solution (alloy) with a Co concentration of about 30 at %, the superparamagnetic phase, and the paramagnetic phase, which is accounted for by the presence of small (a few atoms at most) Co clusters embedded in the Cu matrix. A clearly pronounced maximum in the temperature dependences of the low-field magnetoresistance has been found, which is associated with the temperature of the magnetic phase transition of the supersaturated Co-Cu alloy.
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Держатели документа:
[Khalyapin, D. L.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Khalyapin, D. L.
Kim, P. D.
Turpanov, I. A.
Beten'kova, A. Ya.
Bondarenko, G. V.
Isaeva, T. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kim, J.] Hanyang Univ, Dept Met & Mat Sci, Ansan 426791, South Korea
[Kim, I.] Samsung Elect Mech Co LTD, Cent R&D Inst, EMD Lab, Suwon 443743, Gyunggi Do, South Korea
ИФ СО РАН
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Department of Metallurgical and Material Science, Hanyang University, Sa-3-dong 1271, Ansan 426-791, South Korea
EMD Laboratory, Central R and D Institute, Samsung Electro-Mechanics Co., LTD, 314 Maetan3-Dong, Yeongtong-Gu, Suwon, Gyunggi-Do 443-743, South Korea
Доп.точки доступа:
Khalyapin, D. L.; Kim, P. D.; Ким, Пётр Дементьевич; Kim, J.; Turpanov, I. A.; Турпанов, Игорь Александрович; Beten'kova, A. Ya.; Бетенькова, Анна Яковлевна; Bondarenko, G. V.; Бондаренко, Геннадий Васильевич; Isaeva, T. N.; Kim, I.
}
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10.
Krasnov, P. O.
Interaction of Scandium and Titanium Atoms with a Carbon Surface Containing Five- and Seven-Membered Rings / P. O. Krasnov, N. S. Eliseeva, A. A. Kuzubov> // J. Exp. Theor. Phys. - 2012. -
Vol. 114
,
Is. 1
. - P. 80-84,
DOI
10.1134/S1063776111160059. - Cited References: 25. - We are grateful to the Joint Supercomputer Center, Russian Academy of Sciences, for the possibility of using the computer cluster for our quantum-chemical calculations. This work was supported by the Ministry of Education and Science of the Russian Federation (federal program "Human Capital for Science and Education in Innovative Russia" for 2009-2013). . - ISSN 1063-7761. - ISSN 1090-6509
РУБ
Physics, Multidisciplinary
Рубрики:
MOLECULAR-HYDROGEN COMPLEXES
STORAGE
NANOTUBES
TRANSITION
ENERGY
TEMPERATURE
EXCHANGE
DYNAMICS
METALS
C60
Аннотация:
The use of carbon nanotubes coated by atoms of transition metals to store molecular hydrogen is associated with the problem of the aggregation of these atoms, which leads to the formation of metal clusters. The quantum-chemical simulation of cluster models of the carbon surface of a graphene type with scandium and titanium atoms has been performed. It has been shown that the presence of five- and seven-membered rings, in addition to six-membered rings, in these structures makes it possible to strongly suppress the processes of the migration of metal atoms over the surface, preventing their clustering.
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Публикация на русском языке
Краснов, Павел Олегович. Взаимодействие атомов скандия и титана с углеродной поверхностью, содержащей пятичленные и семичленные кольца [Текст] / П. О. Краснов, Н. С. Елисеева, А. А. Кузубов // Журн. эксперим. и теор. физ. : Наука, 2012. - Т. 141 Вып. 1. - С. 90-95
Держатели документа:
[Krasnov, P. O.
Kuzubov, A. A.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia
[Krasnov, P. O.
Kuzubov, A. A.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Eliseeva, N. S.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
Доп.точки доступа:
Eliseeva, N. S.; Kuzubov, A. A.; Кузубов, Александр Александрович; Краснов, Павел Олегович; Ministry of Education and Science of the Russian Federation
}
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11.
Nature of optical
properties of GdFe3(BO3)4 and GdFe2.1Ga0.9(BO3)4 crystals and other 3d5 antiferromagnets / A. V. Malakhovskii [et al.]> // Eur. Phys. J. B. - 2012. -
Vol. 85
,
Is. 2
. - P. 80,
DOI
10.1140/epjb/e2012-20953-1. - Cited References: 70. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by Russian President Grant NSh-1044.2012.2. . - ISSN 1434-6028
РУБ
Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)4
D-D TRANSITIONS
EARTH FERROBORATES RFE3(BO3)4
ABSORPTION-SPECTRA
OCTAHEDRAL COMPLEXES
ELECTRONIC-STRUCTURE
NEEL TEMPERATURE
FINE-STRUCTURE
EXCHANGE
IONS
Аннотация:
Influence of the partial substitution of paramagnetic Fe3+ ions by diamagnetic Ga3+ ions in the trigonal crystal GdFe3 (BO3)4 on its optical and magnetic properties is studied and discussed in connection with problems common for all antiferromagnets containing 3d 5 ions. Polarized optical absorption spectra and linear birefringence of GdFe3 (BO3)4 and GdFe2.1Ga0.9 (BO3)4 single crystals have been measured in the temperature range 85–293 K. Specific heat temperature dependence (2–300 K) and structure of GdFe2.1Ga0.9 (BO3)4 crystal have been also studied. As a result of substitution of 30% Fe to Ga the Neel temperature diminishes from 38 till 16 K, the strong absorption band edge shifts on 860 cm-1 (0.11 eV) to higher energy and the d-d transitions intensity decreases substantially larger than the Fe concentration does. Strong absorption band edge is shown to be due to Mott-Hubbard transitions. Correlation between position of the strong absorption band edge and the Neel temperature of antiferromagnets has been revealed. Properties of the doubly forbidden d-d transitions in the studied crystals and in other antiferromagnets are explained within the framework of the model of the
exchange
-vibronic pair absorption, which is theoretically analyzed in detail. The model permitted us to determine the connection between parameters of d-d absorption bands (intensity, width and their temperature dependences), on the one hand, and the
exchange
, spin-orbit and electron-lattice interactions, on the other hand.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Leont'ev, A. A.; Леонтьев, Андрей Александрович; Kartashev, A. V.; Карташев, Андрей Васильевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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12.
Superconductivity in repulsive
fermi-systems at low density / M. Y. Kagan [et al.]> // J. Supercond. Nov. Magn. - 2013. -
Vol. 26
,
Is. 9
. - P. 2809-2815,
DOI
10.1007/s10948-013-2262-9. - Cited References: 57. - The authors acknowledge helpful discussions with A. V. Chubukov, A. S. Alexandrov, V. V. Kabanov, K. I. Kugel, Yu. V. Kopaev, N.M. Plakida, N.V. Prokof'ev, M. M. Korovushkin, M. A. Mitskan. M. Yu. K. work was supported by RFBR grant No. 11-02-00741. . - ISSN 1557-1939
Перевод заглавия:
Сверхпроводимость в Ферми-системах с отталкиванием при малых концентрациях
РУБ
Physics, Applied + Physics, Condensed Matter
Рубрики:
T-J MODEL
SUPERFLUID TRANSITION-TEMPERATURE
FRACTIONAL-STATISTICS
PHASE-SEPARATION
HUBBARD-MODEL
GAS
ENHANCEMENT
MECHANISM
EXCHANGE
PARTICLES
Кл.слова (ненормированные):
Anomalous superconductivity
--
p-wave and d-wave pairings
--
Kohn-Luttinger mechanism
--
Shubin-Vonsovsky
--
Hubbard and t-J models
Аннотация:
In the large variety of models such as 3D and 2D Fermi-gas model with hard-core repulsion, 3D and 2D Hubbard model, and the Shubin-Vonsovsky model, we demonstrate the possibility of triplet p-wave pairing at low electron density. We show that the critical temperature of the p-wave pairing can be strongly increased in a spin-polarized case or in a two-band situation already at low density and reach experimentally feasible values of (1-5) K. We also discuss briefly d-wave pairing and high-T-C superconductivity with T-C similar to 100 K, which arises in the 2D t-J model in the range of parameters realistic for cuprates.
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Держатели документа:
PL Kapitsa Phys Problems Inst, Moscow 119334, Russia
Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany
Hofstra Univ, Dept Phys & Astron, Hempstead, NY 11549 USA
Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Kagan, M. Y.; Efremov, D. V.; Mar'enko, M. S.; Val'kov, V. V.; Вальков, Валерий Владимирович; RFBR [11-02-00741]
}
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13.
Ovchinnikov, S. G.
Anisotropic interactions in magnetic crystals with S-state ions. Nanostructures / S. G. Ovchinnikov, V. V. Rudenko> // Phys. Usp. - 2014. -
Vol. 57
,
Is. 12
. - P. 1180-1198,
DOI
10.3367/UFNe.0184.201412b.1299. - Cited References:97. - We are grateful to L M Rudenko, T V Spirina, and N V Veretennikova for the assistance in the preparation of this review. This study was supported in part by the Program of Federal Support for Leading Scientific Schools of the Russian Federation (project No. NSh 1044.2012.2); by the President's Program of Support for Leading Scientific Schools (project No. NSh-2886.2014.2); and by the Russian Foundation for Basic Research (project No. 13-02-00358). . - ISSN 1063. - ISSN 1468-4780. - ISSN
РУБ
Physics, Multidisciplinary
Рубрики:
PARAMAGNETIC-RESONANCE
ANTIFERROMAGNETIC-RESONANCE
EXCHANGE
Аннотация:
Anisotropy mechanisms in compounds with S-state ions are discussed, including the 'single-ion'
exchange
mechanism that was developed theoretically by Nikiforov and coworkers based on the two-ion model and which has only recently received detailed experimental study. Results demonstrating the significant role of the 'single-ion' source are presented. An independent generalized method for quantitatively describing and predicting the anisotropy of magnetically ordered crystals is discussed, and its potential for the investigation of the BiFeO3 multiferroic in the region of the existence of a spin cycloid is examined. The anisotropic interactions responsible for the formation of nanostructures in the form of spin vortices (skyrmions) in MnSi and Cu2OSeO3 are analyzed.
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Публикация на русском языке
Овчинников, Сергей Геннадьевич. Анизотропные взаимодействия в магнитных кристаллах с ионами в S-состоянии. Наноструктуры [Текст] / С. Г. Овчинников, В. В. Руденко // Успехи физ. наук : Ред. журн. "Успехи физ. наук", 2014. - Т. 184 № 12. - С. 1299-1318
Доп.точки доступа:
Rudenko, V. V.; Руденко, Валерий Васильевич; Овчинников, Сергей Геннадьевич; Program of Federal Support for Leading Scientific Schools of the Russian Federation [NSh 1044.2012.2]; President's Program of Support for Leading Scientific Schools [NSh-2886.2014.2]; Russian Foundation for Basic Research [13-02-00358]
}
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14.
Synthesis and magnetic
properties of [(CoP)soft/NiP/(CoP)hard/NiP]n films / G. S. Patrin [et al.]> // J. Low Temp. Phys. - 2016. -
Vol. 182
,
Is. 3-4
. - P. 73-81,
DOI
10.1007/s10909-015-1363-1. - Cited References: 25. - This study was supported by the Ministry of Education and Science of the Russian Federation for the Siberian Federal University, state Order No. 3.2534.2014/K and the Russian Foundation for Basic Research, Project No. 14-02-00238-a. . - ISSN 0022-2291
Перевод заглавия:
Синтез и магнитные свойства пленок [(CoP)soft/NiP/(CoP)hard/NiP]n
РУБ
Physics, Applied + Physics, Condensed Matter
Рубрики:
Exchange
Phase
Model
Кл.слова (ненормированные):
Interlayer coupling
--
Magnetic heterostructure
--
Hysteresis loop
--
Interlayer coupling
--
Magnetic spring
Аннотация:
Magnetic interactions in Co–Ni–P multilayers consisting of alternating magnetically soft and magnetically hard layers are experimentally investigated. The variation in the shape of magnetization loops at the conjugation of magnetically soft and magnetically hard layers and the saturation field oscillations with varying number of layer pairs are established. It is demonstrated that insertion of a nonmagnetic spacer significantly affects the magnetization reversal in the structure. It is concluded that in studying the interlayer coupling it is necessary to take into account the biquadratic interaction.
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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Prospect Svobodny, 79, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Patrin, G. S.; Патрин, Геннадий Семёнович; Shiyan, Ya. G.; Шиян, Ярослав Германович; Patrin, K. G.; Патрин, Константин Геннадьевич; Yurkin, G. Yu.; Юркин, Глеб Юрьевич
}
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15.
The superexchange interactions
and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10 / S. N. Sofronova [et al.]> // J. Magn. Magn. Mater. - 2016. -
Vol. 401
. - P. 217-222,
DOI
10.1016/j.jmmm.2015.10.024. - Cited References: 23. - This study was supported by Russian Foundation for Basic Research (RFFI Siberia No. 15-42-04186). We thank S. Popkov, G. Yurkin for help on the magnetic measurements and M.S. Molokeev for help on the x-ray diffraction . - ISSN 0304-8853
Перевод заглавия:
Суперобменные взаимодействия и магнитное упорядочение в низкомерном людвигите Ni5GeB2O10
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
DIELECTRICS
EXCHANGE
CATION
Кл.слова (ненормированные):
Ludwigites
--
Magnetic order
--
Heat capacity
--
Exchange
interactions
--
Ferrimagnetic
Аннотация:
The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87 K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. © 2015 Elsevier B.V.
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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
M.V. Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Nazarenko, I. I.; Назаренко, Илья Иванович; Volkov, N. V.; Волков, Никита Валентинович; Kartashev, A. V.; Карташев, Андрей Васильевич; Moshkina, E. M.; Мошкина, Евгения Михайловна
}
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16.
Magnetic and resonance
properties of ferrihydrite nanoparticles doped with cobalt / S. V. Stolyar [et al.]> // Phys. Solid State. - 2017. -
Vol. 59
,
Is. 3
. - P. 555-563,
DOI
10.1134/S1063783417030301. - Cited References:30. - This study was supported by the Ministry of Education and Science of the Russian Federation within the framework of the Special Program for the Siberian Federal University, the Russian Foundation for Basic Research (RFBR project no. 16-03-00969), and jointly by the Russian Foundation for Basic Research and the Krasnoyarsk Regional Science Foundation (RFBR-KRSFr-sibir'-a project no. 15-42-04171). . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
6-LINE FERRIHYDRITE
BACTERIAL FERRIHYDRITE
NIO NANOPARTICLES
EXCHANGE
Аннотация:
Powders of undoped ferrihydrite nanoparticles and ferrihydrite nanoparticles doped with cobalt in the ratio of 5: 1 have been prepared by hydrolysis of 3d-metal salts. It has been shown using Mössbauer spectroscopy that cobalt is uniformly distributed over characteristic crystal-chemical positions of iron ions. The blocking temperatures of ferrihydrite nanoparticles have been determined. The nanoparticle sizes, magnetizations, surface anisotropy constants, and bulk anisotropy constants have been estimated. The doping of ferrihydrite nanoparticles with cobalt leads to a significant increase in the anisotropy constant of a nanoparticle and to the formation of surface rotational anisotropy with the surface anisotropy constant Ku = 1.6 × 10–3 erg/cm2.
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Публикация на русском языке
Магнитные и резонансные свойства наночастиц ферригидрита, легированных кобальтом [Текст] / С. В. Столяр [и др.] // Физ. тверд. тела : Наука, 2017. - Т. 59 Вып. 3. - С. 538–545
Держатели документа:
Siberian Fed Univ, Svobodny Pr 79, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Int Sci Ctr Organism Extreme States Res, Presidium Krasnoyarsk Sci Ctr, Siberian Branch, Akademgorodok 50, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Yaroslavtsev, R. N.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Bayukov, O. A.; Баюков, Олег Артемьевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Ladygina, V. P.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Ministry of Education and Science of the Russian Federation within the framework of the Special Program for the Siberian Federal University; Russian Foundation for Basic Research (RFBR) [16-03-00969]; Russian Foundation for Basic Research; Krasnoyarsk Regional Science Foundation (RFBR-KRSFr) [15-42-04171]
}
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