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1.
Особенности спектра тяжелых
фермионов в скошенной фазе антиферромагнитных интерметаллидов [Текст] / В. В. Вальков, Д. М. Дзебисашвили> // Теоретическая и математическая физика. - 2010. -
Т. 162
,
№ 1
. - С. 125-149,
DOI
10.4213/tmf6460 . - ISSN 0564-6162. - ISSN 2305-3135
Перевод заглавия:
Properties of the heavy-fermion spectrum in the canted phase of
antiferromagnetic
intermetallides
Рубрики:
Кл.слова (ненормированные):
периодическая модель Андерсона
--
тяжелые фермионы
--
антиферромагнетизм
--
скошенная фаза
Аннотация:
Изучено влияние индуцированного магнитным полем скоса магнитных подрешеток на энергетическую структуру тяжелофермионных квазичастиц в интерметаллидах с антиферромагнитным типом упорядочения. Исследования выполнены в рамках эффективного гамильтониана периодической модели Андерсона в режиме сильных электронных корреляций. В результате учета виртуальных забросов в высокоэнергетические двоечные состояния этот гамильтониан включает обменные взаимодействия между спиновыми моментами f-ионов, а также s–f-обменную связь между двумя подсистемами. Для неколлинеарной геометрии задачи введено унитарное преобразование, позволившее свести уравнение восьмой степени для спектра тяжелых фермионов к двум уравнениям четвертой степени. Показано, что характер квазиимпульсной зависимости энергии тяжелых фермионов претерпевает качественные изменения при переходе от антиферромагнитной фазы к фазе со значительным углом скоса, возникающим при наложении внешнего магнитного поля.
РИНЦ
Держатели документа:
Институт физики им. Л. В. Киренского СО РАН
Сибирский федеральный университет
Доп.точки доступа:
Вальков, Валерий Владимирович; Дзебисашвили, Дмитрий Михайлович
}
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2.
Микромагнитное моделирование и
численный анализ процессов перемагничивания двухслойных тонкопленочных структур ферромагнетик/антиферромагнетик / Б. А. Беляев [и др.]> // Изв. вузов. Физика. - 2013. -
Т. 56
,
№ 8/2
. - С. 230-232. - Работа выполнена при финансовой поддержке ФЦП «Научные и научно-педагогические кадры инновационной России 2009−2013»
Перевод заглавия:
Micromagnetic simulation and numerical analysis of magnetization reversal processes in thin-film ferromagnetic/
antiferromagnetic
bilayer
Кл.слова (ненормированные):
микромагнитное моделирование
--
ферромагнетик/антиферромагнетик
--
петля гистерезиса
--
обменное смещение
--
коэрцитивная сила
--
micromagnetic simulation
--
coercivity
--
ferromagnetic/
antiferromagnetic
--
hysteresis loop
--
exchange bias
Аннотация:
На основе численного микромагнитного моделирования проведено исследование процессов перемагничивания двухслойных тонкопленочных структур ферромагнетик/антиферромагнетик. Сделан анализ влияния параметров структуры на величину поля обменного сдвига и коэрцитивной силы. Результаты расчета сравниваются с экспериментальными и теоретическими данными.
On the basis of the numerical micromagnetic simulation the study of magnetization reversal processes in thin-film ferromagnetic/
antiferromagnetic
bilayers was performed. The analysis of influence of parameters of the structure on exchange bias field and coercive force was carried out. Calculation results are compared with experimental and theoretical data.
Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Изотов, Андрей Викторович; Izotov, A.V.; Беляев, Борис Афанасьевич; Belyaev, B. A.; Соловьев, Платон Николаевич; Волошин, Александр Сергеевич; Voloshin, A. S.
}
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3.
Weak ferromagnetism and
magnetic-behavior of (CH3NH3)2MNCL4 quasidimetric
antiferromagnetic
/ N. V. Fedoseeva [et al.]> // Fiz. Tverd. Tela. - 1994. -
Vol. 36
,
Is. 9
. - P. 2609-2617. - Cited References: 8 . - ISSN 0367-3294
РУБ
Physics, Condensed Matter
WOS
Доп.точки доступа:
Fedoseeva, N. V.; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Nikolaev, E. M.; Perepelitsa, A. P.
}
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4.
Vasil'ev, V. N.
Investigation of the effect of uniaxial pressure on
antiferromagnetic
resonance in KFe11Ol7 crystals / V. N. Vasil'ev, E. N. Matveiko> // Phys. Solid State. - 1998. -
Vol. 40
,
Is. 3
. - P. 471-473,
DOI
10.1134/1.1130311. - Cited References: 7 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Аннотация:
The deformation dependence of the resonance field in KFe11O17 single crystals was investigated by the AFMR method The measurements were performed at T = 77 K and nu = 47.52 GHz for two orientations of the external pressure, The experimental data are discussed in terms of a model of a very simple easy-place antiferromagnet taking account of the elastic and magnetoelastic contributions to the thermodynamic potential The magnetostriction, magnetoelastic, and elastic contants are calculated and the results are lambda = 1.94 x 10(-5), B-1 = 2.75 X 10(8) erg/cm(3), and C-11-C-12 = 1.42 X 10(13) erg/cm(3), respectively. The values of these constants imply that the origin of the initial gap in the AFMR spectrum is not of magnetoelastic origin. (C) 1998 American Institute of Physics. [S1063-7834(98)02403-4].
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Matveiko, E. N.
}
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5.
Valkov, V. V.
Influence of
antiferromagnetic
ordering on the de Haas-van Alphen effect in a semimetal / V. V. Valkov, D. M. Dzebisashvili> // Phys. Solid State. - 1997. -
Vol. 39
,
Is. 2
. - P. 179-184,
DOI
10.1134/1.1129779. - Cited References: 19 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
NORMAL STATE
OSCILLATIONS
CEAS
Аннотация:
The distinctive characteristics of the de Haas-van Alphen effect in semimetals with
antiferromagnetic
long-range order are investigated theoretically. It is shown that the transition of the subsystem of localized spins from the canted
antiferromagnetic
phase to the ferromagnetic phase is accompanied by an abrupt change in the ''frequency'' of the magnetization oscillations of band carriers M-similar to. In the below-critical range of magnetic fields, M-similar to is not a function periodic in 1/H. Significantly, the additional contribution to the phase of the oscillatory factors is proportional to H-2 and is determined entirely by quantum fluctuations in the
antiferromagnetic
subsystem. (C) 1997 American Institute of Physics.
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Держатели документа:
L.V. Kirenskii Inst. of Phys., Siberian Br. Russ. Acad. of Sci., 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Val'kov, V. V.
}
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6.
Valkov, V. V.
EXCITATION SPECTRUM OF DIMERIZED
ANTIFERROMAGNETIC
HEISENBERG CHAIN / V. V. VALKOV, S. G. OVCHINNIKOV, O. G. PETRAKOVSKII> // Fiz. Tverd. Tela. - 1990. -
Vol. 32
,
Is. 7
. - P. 2001-2003. - Cited References: 5 . - ISSN 0367-3294
РУБ
Physics, Condensed Matter
WOS
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Petrakovskii, G. A.; Петраковский, Герман Антонович; Val'kov, V. V.
}
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7.
Val'kov, V. V.
The magnetoelastic mechanism of singlet phase formation in a two-dimensional quantum antiferromagnet / V. V. Val'kov, V. A. Mitskan, G. A. Petrakovskii> // J. Exp. Theor. Phys. - 2006. -
Vol. 102
,
Is. 2
. - P. 234-247,
DOI
10.1134/S106377610602004X. - Cited References: 18 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
GROUND-STATE
SPIN
TRANSITION
CUGEO3
MODEL
Кл.слова (ненормированные):
Crystal lattices
--
Elasticity
--
Mathematical models
--
Oscillations
--
Phase diagrams
--
Phase transitions
--
Quantum theory
--
Two dimensional
--
Atomic representation
--
Magnetoelastic mechanism
--
Quantum antiferromagnets
--
Singlet phase formation
--
Antiferromagnetic
materials
Аннотация:
A model describing the second-order phase transition with respect to the magnetoelastic coupling parameter from the anti ferromagnetic (AFM) to the singlet state in a two-dimensional quantum magnet on a square lattice is proposed. The spectrum of elementary excitations in the singlet and AFM phases is calculated using an atomic representation, and the evolution of transverse and longitudinal branches of this spectrum is studied in the vicinity of the transition point. It is established that the AFM to singlet phase transition is related to softening of the longitudinal branch of oscillations. In the singlet phase, the gap plays the role of a parameter characterizing the distance to the phase transition point. It is shown that the spectrum of transverse oscillations in the AFM phase corresponds to the Goldstone boson. Based on an analysis of the stability of the spectrum of elementary excitations, a phase diagram is constructed that determines the regions of the existence of phases with plaquette-deformed lattices.
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Держатели документа:
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation
Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Вальков, Валерий Владимирович
}
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8.
Val'kov, V. V.
The electron energy spectrum and superconducting transition temperature of strongly correlated fermions with three-center interactions / V. V. Val'kov, D. M. Dzebisashvili> // J. Exp. Theor. Phys. - 2005. -
Vol. 100
,
Is. 3
. - P. 608-616,
DOI
10.1134/1.1901772. - Cited References: 29 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
T-J MODEL
BAND HUBBARD-MODEL
VALENCE BOND STATE
RANGE-ORDER
SYSTEMS
WAVE
Кл.слова (ненормированные):
Antiferromagnetic
materials
--
Approximation theory
--
Fermions
--
Ground state
--
Hamiltonians
--
Superconductivity
--
Density of states
--
Electron energy spectrum
--
Strongly correlated fermions
--
Superconducting phase
--
Superconducting transition temperature
Аннотация:
The renormalizations of the fermionic spectrum are considered within the framework of the t-J* model taking into account three-center interactions (H-(3)) and magnetic fluctuations. Self-consistent spin dynamics equations for strongly correlated fermions with three-center interactions were obtained to calculate quasi-spin correlators. A numerical self-consistent solution to a system of ten equations was obtained to show that, in the nearest-neighbor approximation, simultaneously including H-(3) and magnetic fluctuations at n > n(1) (n(1) approximate to 0.72 for 2t/U = 0.25) caused qualitative changes in the structure of the energy spectrum. A new Van Hove singularity is then induced in the density of states, and an additional maximum appears in the T-c(n) concentration dependence of the temperature of the transition to the superconducting phase with order parameter symmetry of the d(x2-y2) type. (C) 2005 Pleiades Publishing, Inc.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Tech. University, Krasnoyarsk, 660074, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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9.
Val'kov, V. V.
Quantum temperature fluctuations in the magnetization of
antiferromagnetic
semimetals / V. V. Val'kov, D. M. Dzebisashvili> // Phys. Solid State. - 1998. -
Vol. 40
,
Is. 9
. - P. 1523-1529,
DOI
10.1134/1.1130591. - Cited References: 19 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
FERMI-SURFACE
OSCILLATIONS
SUPERCONDUCTOR
CEAS
Аннотация:
It is shown that in semimetallic, low-temperature
antiferromagnetic
materials located in a quantizing magnetic field, the part of the band magnetization M similar to which oscillates in H can have a nonmonotonic temperature dependence. This non-Fermi liquid behavior will show up experimentally in the form of quantum temperature fluctuations of the magnetization when the decrease with rising temperature is oscillatory, rather than the usual monotonic decrease. It is shown that the magnetization from an individual spin electron (or hole) subband has the form of weakly damped periodic oscillations as a function of T-2. This result makes it possible to develop an efficient method for studying the electronic structure of
antiferromagnetic
semimetals based on an examination of the quantum temperature fluctuations. Calculations show that quantum temperature fluctuations can be observed, for example, in the cerium monopnictides CeP and CeAs, which are strongly correlated,
antiferromagnetic
, compensated semimetals with low Neel temperatures. (C) 1998 American Institute of Physics. [S1063-7834(98)02409-5].
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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10.
Val'kov, V. V.
Properties of the heavy-fermion spectrum in the canted phase of
antiferromagnetic
intermetallides / V. V. Val'kov, D. M. Dzebisashvili> // Theor. Math. Phys. - 2010. -
Vol. 162
,
Is. 1
. - P. 106-125,
DOI
10.1007/s11232-010-0008-4. - Cited References: 23. - This paper was supported by the Russian Foundation for Basic Research (Grant No. 07-02-00226), the Siberian Branch, Russian Academy of Sciences (Integrated Project No. 53), and the program "Strong Electron Correlations" of the Physics Division, Russian Academy of Sciences. . - ISSN 0040-5779
РУБ
Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
PERIODIC ANDERSON MODEL
KONDO-LATTICE
VALENCE
Кл.слова (ненормированные):
periodic Anderson model
--
heavy fermion
--
antiferromagnetism
--
canted phase
--
Antiferromagnetism
--
Canted phase
--
Heavy fermion
--
Periodic Anderson model
Аннотация:
We study the effect of the magnetic-field-induced canting of magnetic sublattices on the energy structure of heavy fermion quasiparticles in intermetallides with
antiferromagnetic
-type ordering. We work in the framework of an effective Hamiltonian of the periodic Anderson model in the regime of strong electron correlations. With the virtual transfers into high-energy double states taken into account, this Hamiltonian involves exchange interactions between spin moments of the f ions and the s-f-exchange coupling between the two subsystems. For a noncollinear problem geometry, we introduce a unitary transformation that allows reducing an eighth-order equation for the spectrum of heavy fermions to two fourth-order equations. We show that the quasimomentum dependence of the heavy-fermion energy changes qualitatively under the transition from the
antiferromagnetic
phase to a phase with a considerable canting angle emerging in an external magnetic field.
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Держатели документа:
[Val'kov, V. V.] RAS, Siberian Branch, Inst Phys, Krasnoyarsk, Russia
[Dzebisashvili, D. M.] Fed Siberian Univ, Krasnoyarsk, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Federal Siberian University, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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11.
Val'kov, V. V.
Electron spectrum and heat capacity of heavy fermions in the canted phase of
antiferromagnetic
intermetallides / V. V. Val'kov, D. M. Dzebisashvili> // J. Exp. Theor. Phys. - 2010. -
Vol. 110
,
Is. 2
. - P. 301-318,
DOI
10.1134/S1063776110020147. - Cited References: 41. - This study was supported by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences, interdisciplinary integration project no. 53 of the Siberian Branch of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 07-02-00226). . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
PERIODIC ANDERSON MODEL
PRESSURE-INDUCED SUPERCONDUCTIVITY
KONDO-LATTICE
FERROMAGNETISM
FLUCTUATIONS
COEXISTENCE
CERHIN5
SYSTEMS
DIAGRAM
CENISN
Кл.слова (ненормированные):
Antiferromagnetic
phase
--
Antiferromagnetics
--
Antiferromagnets
--
Electron spectrum
--
Electronic heat capacity
--
Energy spectra
--
Experimental data
--
External magnetic field
--
Heat capacities
--
Heavy fermion
--
Low temperatures
--
Magnetic sublattices
--
Magnetic subsystems
--
Sommerfeld constant
--
Structural rearrangement
--
Temperature dependence
--
Antiferromagnetism
--
Cerium
--
Cerium compounds
--
Fermions
--
Magnetic fields
--
Phase transitions
--
Specific heat
--
Spectroscopy
--
Antiferromagnetic
materials
Аннотация:
The energy spectrum of heavy fermions in an external magnetic field is calculated for canted magnetic sublattices of
antiferromagnetic
intermetallides. This makes it possible to determine low-temperature features of electronic heat capacity of heavy-fermion antiferromagnets with the metal-type ground state taking into account the structural rearrangement of the magnetic subsystem. The calculated temperature dependences of the magnetization, heat capacity, and Sommerfeld constant in the vicinity of the point of transition to the
antiferromagnetic
phase correlate with experimental data obtained for heavy-fermion antiferromagnets PuGa3, Ce2Au2Cd, YbNiSi3, and PuPd5Al2.
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Публикация на русском языке
Электронный спектр и теплоемкость тяжелых фермионов в скошенной фазе антиферромагнитных интерметаллидов [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Журнал экспериментальной и теоретической физики. - Москва : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 137 № 2. - С. 341-360
Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberian Fed Univ, Krasnoyarsk 660075, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660075, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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12.
Val'kov, V. V.
Effects of inelastic spin-dependent electron transport through a spin nanostructure in a magnetic field / V. V. Val'kov, S. V. Aksenov> // J. Exp. Theor. Phys. - 2011. -
Vol. 113
,
Is. 2
. - P. 266-275,
DOI
10.1134/S1063776111060070. - Cited References: 30. - This study was carried out under the program of the Physical Science Department of the Russian Academy of Sciences, Federal Target Program "Scientific and Scientific-Pedagogical Personnel of Innovative Russia in 2009-2013," Interdisciplinary Integration project no. 53 of the Siberian Branch of the Russian Academy of Sciences, and under partial support from the Russian Foundation for Basic Research (project no. 09-02-00127). The research work of one of the authors (S.V.A) was supported by grant no. MK-1300.2011.2 from the President of the Russian Federation. . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
CONDUCTION
ANISOTROPY
JUNCTIONS
Кл.слова (ненормированные):
Antiferromagnetic
coupling
--
Colossal magnetoresistance effect
--
IV characteristics
--
Metallic contacts
--
Potential profiles
--
Spectral characteristics
--
Spin dependent transport
--
Spin dimer
--
Spin moments
--
Spin-dependent electron transport
--
Spin-flip process
--
Tight-binding approximations
--
Transmission coefficients
--
Antiferromagnetism
--
Colossal magnetoresistance
--
Current voltage characteristics
--
Electric resistance
--
Nanostructures
--
Transport properties
--
Magnetic field effects
Аннотация:
The transport properties and current-voltage (I-V) characteristics of a system of spin dimers with
antiferromagnetic
coupling arranged between metallic contacts are investigated in the tight binding approximation using the Landauer-Buttiker formalism. It is shown that the s-d(f) exchange interaction between the spin moments of the electrons being transported and the spins of the nanostructure leads to the formation of a potential profile as well as its variation due to spin-flip processes. As a result, the spin-dependent transport becomes inelastic, and the transmission coefficient and the I-V characteristic are strongly modified. It is found that the application of a magnetic field induces additional transparency peaks in the spectral characteristic of the system and causes the colossal magnetoresistance effect.
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Держатели документа:
[Val'kov, V. V.
Aksenov, S. V.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Aksenov, S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Val'kov, V. V.] Reshetnikov Siberian State Aerosp Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnikov Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович
}
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13.
Val'kov, V. V.
Effective temperature scattering matrix and kinematic mechanism of cooper instability in
antiferromagnetic
rare-earth intermetallides / V. V. Val’kov, A. O. Zlotnikov, T. A. Val’kova> // Bull. Russ. Acad. Sci. Phys. - 2015. -
Vol. 79
,
Is. 6
. - P. 746-748,
DOI
10.3103/S1062873815060349. - Cited References: 22. - This work was supported by the Presidium of the Russian Academy of Sciences, program no. 20.7; by the Russian Foundation for Basic Research, project no. 13-02-00523; and by regional grant Siberia 13-02-98013. - A.O. Zlotnikov acknowledges the support of RF Presidential Grant no. SP-1370.2015.5. . - ISSN 1062-8738
Аннотация:
An effective temperature-dependent scattering matrix for a localized subsystem is obtained in the periodic Anderson model by summing itinerant variables in the diagrammatic series of perturbation theory. The effective interaction that occurs in this case can lead to an
antiferromagnetic
phase, a superconducting phase, and the phase of coexisting superconductivity and antiferromagnetism observed in heavy-fermion intermetallic compounds. © 2015, Allerton Press, Inc.
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Публикация на русском языке
Вальков, Валерий Владимирович. Эффективная температурная матрица рассеяния и кинематический механизм куперовской неустойчивости в антиферромагнитных редкоземельных интерметаллидах [Текст] / В. В. Вальков, A. O. Злотников, Т. А. Валькова // Изв. РАН. Сер. физич. - 2015. - Т. 79 № 6. - С. 823–825
Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Val’kova, T. A.; Вальков, Валерий Владимирович
}
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14.
Val'kov, V. V.
Effect of the concentration-dependent spin-charge correlations on the evolution of the energy structure of the 2D Emery model / V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov> // J. Exp. Theor. Phys. - 2014. -
Vol. 118
,
Is. 6
. - P. 959-970,
DOI
10.1134/S1063776114060223. - Cited References: 48. - This work was supported by the program "Quantum Physics of Mesoscopic and Disordered Systems" of the Presidium of the Russian Academy of Sciences, the Russian Foundation for Basic Research (project nos. 13-02-00909, 13-02-00523, and 13-02-98013_r-sibir), and the Dynasty foundation. . - ISSN 1063-7761. - ISSN 1090-6509
РУБ
Physics, Multidisciplinary
Рубрики:
SADDLE-POINT SINGULARITY
CUPRATE SUPERCONDUCTORS
FERMI-SURFACE
ANTIFERROMAGNETIC
CORRELATIONS
NORMAL-STATE
Bi2Sr2CaCu2O8+δ
EXCITATIONS
YBa2Cu3O6.9
La2CuO4
YBa2Cu4O8
Аннотация:
It is shown using the 2D Emery model that the strong coupling between the spin subsystem of copper ions in the singlet state and the subsystem of oxygen holes considerably reduces the spectral intensity of the correlation function for holes on the Fermi contour. Spin-charge correlations are manifested in the existence of two channels. The first channel is due to the p-d exchange coupling of spins of the oxygen and copper holes. The second channel appears as a result of spin-correlated hoppings, when the motion of holes over oxygen ions is accompanied by spin-flip processes (i.e., simultaneous changes in the spin projections of an oxygen hole and a copper ion). It is established as a result of self-consistent calculations that the allowance for the concentration dependence of spin correlators and multicenter spin-charge correlators appearing in the dispersion equation ensures a decrease in the energy of the system and considerably affects the evolution of the Fermi surface under hole doping.
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Публикация на русском языке
Вальков, Валерий Владимирович. Влияние концентрационно-зависимых спин-зарядовых корреляций на эволюцию энергетической структуры двумерной модели Эмери [Текст] / В. В. Вальков, Д. М. Дзебисашвили, А. Ф. Барабанов // Ж. эксперим. и теор. физ. : Наука, 2014. - Т. 145 Вып. 6. - С. 1087-1100
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Russian Acad Sci, Inst High Pressure Phys, Moscow 142190, Russia
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Барабанов А. Ф.; Вальков, Валерий Владимирович; Presidium of the Russian Academy of Sciences; Russian Foundation for Basic Research [13-02-00909, 13-02-00523, 13-02-98013_r-sibir]; Dynasty foundation
}
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15.
Val'kov, V. V.
Effect of pressure on
antiferromagnetic
and superconducting ordering in systems with heavy fermions / V. V. Val'kov, A. O. Zlotnikov> // Bull. Russ. Acad. Sci.: Phys. - 2012. -
Vol. 76
,
Is. 7
. - P. 733-736,
DOI
10.3103/S1062873812070362. - Cited References: 7. - This work was supported by the Department of Physical Sciences, Russian Academy of Sciences (the Strong Electron Correlations Program); the Russian Foundation for Basic Research, projects nos. 100200251 and 110200741; the RFBR Sibir’, project no. 110298007; and by the federal target program Scientific and Pedagogical Personnel of an Innovative Russia, 2009–2013. . - ISSN 0022-2860
Кл.слова (ненормированные):
Antiferromagnetic
orderings
--
Antiferromagnetic
orders
--
Antiferromagnetic
phasis
--
Antiferromagnetics
--
Cooper instability
--
Effect of pressure
--
External pressures
--
Heavy fermion
--
Impurity level
--
Localized state
--
Periodic Anderson model
--
Seed energy
--
Spin moments
--
Superconducting ordering
--
Superexchange interaction
--
Superconductivity
--
Antiferromagnetism
Аннотация:
Characteristics of the superconducting and
antiferromagnetic
phases of heavy-fermion intermet-allides are described within a periodic Anderson model with allowance for the superexchange interaction between spin moments of the localized states. It is shown that an external pressure that changes the seed energy of an impurity level can rapidly destroy the long-range
antiferromagnetic
order. The development of the Cooper instability near such an order-disorder transition induces the experimentally observed state in which superconductivity coexists with the
antiferromagnetic
ordering. В© 2012 Allerton Press, Inc.
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Публикация на русском языке
Вальков, Валерий Владимирович. Влияние давления на антиферромагнитное и сверхпроводящее упорядочение в системах с тяжелыми фермионами [Текст] / В. В. Вальков, A. O. Злотников // Изв. РАН. Сер. физич. - 2012. - Т. 76 № 7. - С. 821-824
Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; International Interdisciplinary Symposium “Ordering in Minerals and Alloys” (14th ; 8 -13 Sept. 2011 ; Rostov-on-Don)
}
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16.
Val'kov, V. V.
Canted phase of an
antiferromagnetic
Anderson lattice / V. V. Val'kov, D. M. Dzebisashvili> // Physica B. - 2006. -
Vol. 378-80
: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 692-693,
DOI
10.1016/j.physb.2006.01.223. - Cited References: 5 . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Кл.слова (ненормированные):
heavy fermions
--
antiferromagnetic
canted phase
--
Antiferromagnetic
canted phase
--
Heavy fermions
--
Antiferromagnetism
--
Band structure
--
Magnetic field effects
--
Magnetic fields
--
Magnetization
--
Spectrum analysis
--
Thermal effects
--
Antiferromagnetic
canted phase
--
Energy spectrum
--
Heavy fermions
--
Quasiparticle bands
--
Fermions
Аннотация:
On the basis of extended periodic Anderson model with anti ferromagnetic (AFM) exchange and s-f exchange interactions the energy spectrum of heavy-fermion (HF) AFM metals is calculated. The quasiparticle band structure in collinear AFM phase is described by four splitted bands one of which is very narrow (order of exchange interaction constant) and lies in the vicinity of a localized level. Application of an external magnetic field causes a canting of the sublattice magnetization and due to s-f exchange interaction strongly modifies the HF band picture. Thus eight different quasiparticle bands appear. Their evolution when temperature and magnetic field change is studied. (c) 2006 Elsevier B.V. All rights reserved.
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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660075, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
ИФ СО РАН
L.V.Kirensky Institute of Physics, Krasnoyasrk 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660075, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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17.
Val'kov, V. V.
Antiferromagnetic
excitonic insulator / V. V. Val’kov> // J. Exp. Theor. Phys. - 2023. -
Vol. 137
,
Is. 4
: Special Issue dedicated to the 95th Anniversary of L. A. Prozorova. - P. 474-485,
DOI
10.1134/S1063776123100138. - Cited References: 39 . - ISSN 1063-7761. - ISSN 1090-6509
Аннотация:
The effective the two-band Hamiltonian is obtained for iridium oxides with account for strong electron correlations (SEC) and the spin–orbit interaction. The intraatomic electron correlations in iridium ions induce the formation of Hubbard fermions (HF) filling the states in the valence band. Another consequence of SEC is associated with the emergence of the
antiferromagnetic
(AFM) exchange interaction between HF in accordance with the Anderson mechanism. As a result, a long-range
antiferromagnetic
order is established in the system, and in the conditions of band overlapping, the intersite Coulomb interaction induces a phase transition to the excitonic insulator (EI) state with a long-range AFM order. The system of integral self-consistent equations, the solution to which determines the excitonic order parameter components Δi, j(k), sublattice magnetization M, Hubbard fermion concentration nd, and chemical potential μ, is obtained using the atomic representation, the method of two-time temperature Green’s functions, and the Zwanzig–Mori projection technique. The symmetry classification of AFM EI phases is performed, and it is shown that in the nearest neighbor approximation, state Δi, j(k) with the s-type symmetry corresponds to the ground state, while the phases with the d- and p-symmetries are metastable.
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Публикация на русском языке
Вальков, Валерий Владимирович. Антиферромагнитный экситонный диэлектрик [Текст] / В. В. Вальков. - 13 с. // Журн. эксперим. и теор. физ. - 2023. - Т. 164 Вып. 4 : Специальный выпуск, посвященный 95-летию Л. А. Прозоровой. - С. 550-562
Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Доп.точки доступа:
Вальков, Валерий Владимирович
}
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18.
Val'kov, V. V.
Anomalies in the characteristics of electronic structure upon a quantum phase transition to a state with two order parameters and the breaking of time-reversal symmetry / V. V. Val’kov, A. O. Zlotnikov> // Bull. Russ. Acad. Sci. Phys. - 2016. -
Vol. 80
,
Is. 6
. - P. 616-619,
DOI
10.3103/S106287381606040X. - Cited References: 9 . - ISSN 1062-8738
Кл.слова (ненормированные):
Antiferromagnetism
--
Electronic structure
--
Phase transitions
--
Temperature distribution
--
Antiferromagnetic
order parameter
--
Density of state
--
Landau expansion
--
Periodic Anderson model
--
Quantum phase transitions
--
Temperature dependence
--
Time reversal symmetries
--
Two order parameters
--
Quantum theory
Аннотация:
Based on the periodic Anderson model, microscopic expressions for the Ginzburg–Landau expansion coefficients in a phase with superconducting and
antiferromagnetic
order parameters are obtained. Temperature dependences of the order parameters near the temperature of the transition to this phase are established. The emergence of anomalous properties upon the quantum phase transition to the phase with two order parameters is investigated. This transition is accompanied by drastic reconstruction of the density of states, reflected by the interplay between superconductivity and antiferromagnetism. © 2016, Allerton Press, Inc.
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Публикация на русском языке
Вальков, Валерий Владимирович. Аномалии характеристик электронной структуры при квантовом фазовом переходе в состояние с двумя параметрами порядка и нарушенной симметрией относительно инверсии времени [Текст] / В. В. Вальков, А. О. Злотников // Изв. РАН. Сер. физ. - 2016. - Т. 80 № 6. - С. 683-686
Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
}
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19.
Unusual magnetic phase
transitions in Gd3+ clusters in multicomponent oxide glasses / J. . Kliava [et al.]> // J. Supercond. Nov. Magn. - 2007. -
Vol. 20
,
Is. 2
. - P. 149-153,
DOI
10.1007/s10948-006-0116-4. - Cited References: 7 . - ISSN 1557-1939
РУБ
Physics, Applied + Physics, Condensed Matter
Рубрики:
GADOLINIUM
RESONANCE
Кл.слова (ненормированные):
oxide glasses
--
gadolinium
--
magnetic clusters
--
superparamagnetism
--
Gadolinium
--
Magnetic clusters
--
Oxide glasses
--
Superparamagnetism
--
Magnetic clusters
--
Magnetic phase transitions
--
Oxide glasses
--
Weiss constant
--
Antiferromagnetic
materials
--
Ferromagnetic materials
--
Gadolinium
--
Magnetic anisotropy
--
Magnetic susceptibility
--
Paramagnetic resonance
--
Phase transitions
--
Positive ions
--
Superparamagnetism
--
Glass
Аннотация:
Magnetic susceptibility, EPR and optical properties have been studied in a glass system {20La(2)O(3) - 22Al(2)O(3) - 23B(2)O(3) - 35(SiO2 + GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses; two magnetic transitions at 55 and 12 K have been detected and ascribed, respectively, to ferromagnetic and
antiferromagnetic
clusters of Gd3+ ions. The EPR spectra confirm the clustering at higher Gd contents. At low temperatures the cluster-related resonance indicates an onset of magnetic anisotropy. The clustering, depending on the Gd concentration, correlates with a shift to lower energies of the strong optical absorption band edge.
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Держатели документа:
Univ Bordeaux 1, Cours Liberat 351, CP MOH, UMR 5798, F-33405 Talence, France
RAS, SB, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
SV Vavilov State Opt Inst, St Petersburg 199034, Russia
ИФ СО РАН
CPMOH, UMR 5798 CNRS-Universite Bordeaux-I, 33405 Talence Cedex, France
L.V. Kirensky Institute of Physics, SB, RAS, Krasnoyarsk 660036, Russian Federation
Bar-Ilan University, Department of Physics, Ramat-Gan 52900, Israel
S.V. Vavilov State Optical Institute, St.-Petersburg 199034, Russian Federation
CPMOH, Universite Bordeaux-I, 351 Cours de la Liberation, 33405 Talence Cedex, France
Доп.точки доступа:
Kliava, J.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Bruckental, I.; Yeshurun, Y.; Zarubina, T.
}
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20.
Uniaxial magnetic anisotropy
of rhombohedral CoCO3 crystals at T = 0 K / V. V. Men'shikov [et al.]> // Phys. Solid State. - 2014. -
Vol. 56
,
Is. 3
. - P. 468-472,
DOI
10.1134/S1063783414030196. - Cited References: 21 . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
ANTIFERROMAGNETIC
RESONANCE
IONS
Аннотация:
A method for calculating the contribution of exchange interaction to uniaxial anisotropy with the use of g' factors has been worked out using CoCO3 crystals as an example. The calculated contribution of dipole-dipole interactions to the anisotropy of CoCO3 is 0.93 cm(-1). The sum of the contributions to the anisotropy constant of CoCO3 with the inclusion of the dipole-dipole interactions is 36.1 cm(-1).
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Публикация на русском языке
Одноосная магнитная анизотропия ромбоэдрических кристаллов CoCO3 при T = 0K [Текст] / В. В. Меньшиков [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2014. - Т. 56 Вып. 3. - С. 459-462
Доп.точки доступа:
Men'shikov, V. V.; Меньшиков, Виктор Васильевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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