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1.
Bondarenko, I. N.
Magnetic transitions in layered triangular antiferromagnets / I. N. Bondarenko, R. S. Gekht, V. I. Ponomarev> // Phys. Lett. A. - 1996. -
Vol. 222
,
Is. 4
. - P. 269-274,
DOI
10.1016/0375-9601(96)00635-4. - Cited References: 22 . - ISSN 0375-9601
РУБ
Physics, Multidisciplinary
Рубрики:
HEISENBERG-ANTIFERROMAGNET
PHASE
-
TRANSITION
VBR2
SYSTEMS
FIELD
VCL2
Кл.слова (ненормированные):
triangular antiferromagnets
--
quantum and thermal fluctuations
--
successive
phase
transitions
--
Quantum and thermal fluctuations
--
Successive
phase
transitions
--
Triangular antiferromagnets
Аннотация:
Magnetic states and
phase
transitions of the layered triangular antiferromagnets in an applied field are studied. It is shown that in compounds like VBr2 and VCl2 quantum effects change the ground state structure and cause successive
phase
transitions as the magnetic field increases. Coplanar structures of different spin configuration are realized far from the saturation field and a noncoplanar structure of umbrella-type configuration is realized near this field. The ground-state
phase
diagram is constructed, and a finite region of fields where the collinear
phase
is also possible is indicated.
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Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Gekht, R. S.; Ponomarev, V. I.
}
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2.
Averyanov, E. M.
Orientation ordering and critical behavior of discoid nematics / E. M. Averyanov> // Zhurnal Eksperimentalnoi Teor. Fiz. - 1996. -
Vol. 110
,
Is. 5
. - P. 1820-1840. - Cited References: 55 . - ISSN 0044-4510
РУБ
Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTALS
PHASE
-
TRANSITION
ISOTROPIC-
PHASE
LOCAL FIELD
SMECTIC-A
MOLECULES
SUSCEPTIBILITY
CONFORMATION
PARAMETER
DYNAMICS
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}
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3.
Avramov, P. V.
Atomic-core dynamics and the electronic structure of some endo- and exohedral complexes of fullerenes with light elements / P. V. Avramov, S. A. Varganov, S. G. Ovchinnikov> // Phys. Solid State. - 2000. -
Vol. 42
,
Is. 11
. - P. 2168-2175,
DOI
10.1134/1.1324059. - Cited References: 39 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
M-AT-C-60 ENDOHEDRAL COMPLEXES
MOLECULAR-DYNAMICS
PHASE
-
TRANSITION
AB-INITIO
SOLID C60
C-60
IONS
Аннотация:
The atomic and electronic structure of some endo-, exo-, and endo-exohedral complexes of the fullerene C-60 with various guest atoms and molecules (He-n, H-2, and Li-2) are investigated using semiempirical and nonempirical quantum-chemical methods. The atomic core dynamics is studied by the method of molecular dynamics. It is shown that guest atoms and molecules in fullerene polyhedra acquire an orbital angular momentum due to the correlated motion of nuclei above the low-energy barriers of the potential surface within the carbon polyhedron even at low temperatures (from 4 to 78 K). The emergence of orbital angular momenta of nuclei of guest atoms and molecules is attributed to a change in the contribution of the orbital angular momentum of electrons to the potential surface of the complexes. The motion of Li ions in a polyhedron leads to blurring of the top of the valence band and to the emergence of a charge polarization wave in the carbon polyhedron. (C) 2000 MAIK "Nauka/Interperiodica".
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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
ИФ СО РАН
Доп.точки доступа:
Varganov, S. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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4.
Ovchinnikov, S. G.
Many-electron model of band structure and metal-insulator
transition
under pressure in FeBO3 / S. G. Ovchinnikov> // JETP Letters. - 2003. -
Vol. 77
,
Is. 12
. - P. 676-679,
DOI
10.1134/1.1604419. - Cited References: 20 . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
PHASE
-
TRANSITION
FERROMAGNETISM
STATE
Аннотация:
A many-electron model is proposed for the band structure of FeBO3 with regard to strong electron correlations in the d (4), d (5), and d (6) configurations. Under normal conditions, FeBO3 is characterized by a dielectric charge-transfer gap in the strong correlation regime U W. With increasing pressure, not only does the d-band W width grow but simultaneously the effective Hubbard parameter U-eff sharply drops, which is due to the crossover of high-spin and low-spin ground state terms of the Fe2+, Fe3+, and Fe4+ ions. It is predicted that a
transition
from the semiconducting antiferromagnetic state to the metallic paramagnetic state will occur in the high-pressure
phase
with increasing temperature. (C) 2003 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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5.
Aver'yanov, E. M.
Fluctuations of orientational order in a uniaxial nematic liquid crystal with biaxial molecules and its response to an external field / E. M. Aver'yanov> // Phys. Solid State. - 2003. -
Vol. 45
,
Is. 5
. - P. 990-1001,
DOI
10.1134/1.1575350. - Cited References: 30 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
PHASE
-
TRANSITION
SMECTIC-A
PARTICLES
SYSTEM
LANDAU
MODEL
Аннотация:
Homogeneous thermal fluctuations of the orientational order parameters S and G of biaxial molecules in a uniaxial nematic liquid crystal are investigated in the framework of the molecular-statistical theory. It is demonstrated that the molecular biaxiality significantly affects the order parameters S and G, their temperature dependences in the nematic
phase
, the amplitude and the temperature dependence of the order parameter fluctuations in the nematic and isotropic phases, and the character of the
transition
from the nematic
phase
to the isotropic liquid
phase
. It is established that the fluctuations of the parameters S and G in the nematic
phase
are related to the temperature dependences of S and G and the susceptibilities chi(S) and chi(G) of the nematic liquid crystal to external fields, which leads to a change in the parameters S and G at a fixed director orientation. Explanations are offered for the known experimental data on the orientational ordering of biaxial molecules under the action of external fields in the isotropic
phase
of nematic liquid crystals. (C) 2003 MAIK "Nauka/Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Аверьянов, Евгений Михайлович
}
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6.
Raman spectra and
pressure-induced lattice instabilities in RbMnCl3 crystal / A. N. Vtyurin [et al.]> // 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA) : WILEY-V C H VERLAG GMBH, 2004. - 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA). - P. 3097-3100,
DOI
10.1002/pssc.200405332. - Cited References: 14 . - ISBN 3-527-40588-7
РУБ
Physics, Condensed Matter
Рубрики:
PHASE
-
TRANSITION
SPECTROSCOPY
Кл.слова (ненормированные):
Frequencies
--
Hydrostatic pressure
--
Mathematical models
--
Parameter estimation
--
Raman scattering
--
Spectrometers
--
Stability
--
Ambient conditions
--
Anomalies
--
Lattice instabilities
--
Structural units
--
Rubidium compounds
Аннотация:
Raman scattering spectra of the RbMnCl3 crystal have been studied under ambient conditions and under high hydrostatic pressure. The results produced have been interpreted with the ab initio model. The experimental data agree well with the estimated values in the low frequency range and show a slightly worse agreement at higher frequencies. A
phase
transition
from the hexagonal
phase
to the perovskite
phase
predicted earlier within the same model was observed under high pressure (above 0.7 GPa) and new transitions to lower symmetry phases were found at higher pressures (1.1 GPa and 5 GPa). (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Inst. of Mineralogy and Petrography, 630090 Novosibirsk, Russian Federation
Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Shefer, A. D.; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович
}
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7.
Analysis of the
electrical and optical properties of VBO3 single crystals and Fe1-xVxBO3 solid solutions on the basis of a many-electron model of energy band structure / N. B. Ivanova [et al.]> // Phys. Solid State. - 2004. -
Vol. 46
,
Is. 8
. - P. 1462-1468,
DOI
10.1134/1.1788779. - Cited References: 32. - One of the authors (M.M.A.) would like to thank the Deutsche Forschungsgemeinschaft (SFB608) for financial support. This study was supported by the Russian Foundation for Basic Research (project no. 03-02-16286), the program "Integration" (project no. B0017), and the program of the Division of Physical Sciences of the Russian Academy of Sciences "Strongly Correlated Electrons" . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
CALCITE STRUCTURE
PHASE
-
TRANSITION
FERRIC BORATE
HIGH-PRESSURE
FEBO3
FE1-XCRXBO3
FERROMAGNET
MOSSBAUER
SPECTRA
Аннотация:
A many-electron model of the energy band structure of VBO3 and of Fe1 - xVxBO3 solid solutions is proposed with strong electron correlations taken into account. Experimental optical absorption spectra and data on the resistivity are discussed in the framework of the suggested model. Variation in the magnetic and electronic properties of VBO3 and Fe1 - xVxBO3 under high pressure is predicted. For VBO3, a Mott-Hubbard (insulator-metal)
transition
is expected in the high-pressure
phase
. In Fe1 - xVxBO3 solid solutions, a nontrivial variation in the properties is predicted, leading to the appearance of a different magnetic state. (C) 2004 MAIK "Nauka / Interperiodica".
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Публикация на русском языке
Анализ электрических и оптических свойств монокристаллов VBO[3] и твердых растворов Fe[1-x]V[x]BO[3] на основе многоэлектронной модели из зонной структуры [Текст] / Н. Б. Иванова [и др.] // Физ. тверд. тела. - 2004. - Т. 46 Вып. 8. - С. 1422-1427
Держатели документа:
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
ИФ СО РАН
Krasnoyarsk State Tech. University, Krasnoyarsk, 660074, Russian Federation
II. Physikalisches Institut, Universitat zu Koln, Koln, 50937, Germany
Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Markov, V. V.; Марков, Владимир Витальевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Abd-Elmeguid, M. M.
}
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8.
Ovchinnikov, S. G.
The energy band structure and optical spectra of FeBO3 calculated with allowance for strong electron correlations / S. G. Ovchinnikov, V. N. Zabluda> // J. Exp. Theor. Phys. - 2004. -
Vol. 98
,
Is. 1
. - P. 135-143,
DOI
10.1134/1.1648107. - Cited References: 32. - This study was supported by the Russian Foundation for Basic Research (project no. 03-02-16286) and by the “Strongly Correlated Electrons” Program of the Department of Physical Sciences of the Russian Academy of Sciences . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
PHASE
-
TRANSITION
HIGH-PRESSURE
FERROMAGNETISM
MODEL
Кл.слова (ненормированные):
Atomic physics
--
Band structure
--
Charge transfer
--
Excitons
--
Green's function
--
Light absorption
--
Dielectric gap
--
Energy band structure
--
Lehmann spectral representation
--
Optical spectra
--
Iron compounds
Аннотация:
A model of the energy band structure of iron borate (FeBO3) is proposed that combines a one-electron description of the sp states of boron and oxygen with a many-electron description of the d states of iron. The Green functions of d electrons are calculated using the exact Lehmann spectral representation. The energies of the d-type quasiparticles are calculated using terms of the d(4) , d(5) , and d(6) electron configurations. The optical absorption spectrum of FeBO3 is determined by local excitons and by the electron excitations with charge transfer. The latter excitations control the nature of the dielectric gap in FeBO3 crystals. The model parameters are determined from a comparison to the exciton energies. The density of single-particle states in FeBO3 is calculated. The main bands in the calculated optical absorption spectrum agree well with experimental data for energies up to 3 eV. (C) 2004 MAIK "Nauka/Interperiodica".
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Публикация на русском языке
Овчинников, Сергей Геннадьевич. Энергетическая структура и оптические спектры FeBO[3] с учетом сильных электронных корреляций [Текст] / С. Г. Овчинников, В. Н. Заблуда // Журн. эксперим. и теор. физ. - 2004. - Т. 125 Вып. 1. - С. 150-159
Держатели документа:
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Zabluda, V. N.; Заблуда, Владимир Николаевич; Овчинников, Сергей Геннадьевич
}
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9.
Gekht, R. S.
A quantum spin liquid in a two-layer triangular antiferromagnet / R. S. Gekht, I. N. Bondarenko> // J. Exp. Theor. Phys. - 2005. -
Vol. 101
,
Is. 5
. - P. 868-880,
DOI
10.1134/1.2149066. - Cited References: 43 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
DIMER GROUND-STATE
MEAN-FIELD THEORY
HEISENBERG-ANTIFERROMAGNET
SYSTEM SRCU2(BO3)(2)
PHASE
-
TRANSITION
GAP
FLUCTUATIONS
EXCITATIONS
LATTICE
Кл.слова (ненормированные):
Antiferromagnetic materials
--
Magnetic fields
--
Magnetization
--
Phase
diagrams
--
Spectrum analysis
--
Thermodynamics
--
Analogous systems
--
Square lattices
--
Thermodynamic quantities
--
Two-layer triangular antiferromagnets
--
Quantum theory
Аннотация:
The possibility of implementing a quantum-spin-liquid-type state in a two-layer triangular spin-1/2 antiferromagnet at T = 0 is investigated. The ratio of intra- to interlayer exchange constants (j) is found under which a
transition
from the classical state with 120 degrees triangular order to a quantum state with zero magnetization per site occurs; in this case, the spins of adjacent layers form singlets that are separated from triplet excitations by an energy gap. Compared with an analogous system with the square lattice, the range of j in which the classical ordered state is realized turns out to be an order of magnitude smaller due to the effects of frustration; in this case, the behavior of thermodynamic quantities is analogous, on the whole, to that in two-layer square lattices; a difference manifests itself in the behavior of the gap in the spectrum of quasiparticles in an external magnetic field h. For small fields h, a j-h
phase
diagram is constructed that determines the domains in which the 120 degrees and the singlet phases exist. It is established that, in the neighborhood of the second-order
phase
transition
, the contribution, to the thermodynamic quantities, of longitudinal spin fluctuations, which are disregarded in the spin-wave description, is comparable to the contribution of transverse fluctuations. (c) 2005 Pleiades Publishing, Inc.
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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Доп.точки доступа:
Bondarenko, I. N.
}
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10.
Zinenko, V. I.
Statistical mechanics of cation ordering in PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions / V. I. Zinenko, S. N. Sofronova> // Phys. Solid State. - 2005. -
Vol. 47
,
Is. 12
. - P. 2309-2314,
DOI
10.1134/1.2142896. - Cited References: 17 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
PHASE
-
TRANSITION
PEROVSKITE
DISORDER
FERROELECTRICS
CRYSTALS
MODEL
Аннотация:
A model Hamiltonian for B cation ordering (Sc-Nb(Ta)) in PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 solid solutions is constructed. The parameters of the model Hamiltonian are determined from the ab initio calculation within the ionic crystal model with allowance made for the deformability and the dipole and quadrupole polarizabilities of the ions. The temperatures of the
phase
transition
due to the ordering of the B cations are calculated by the Monte Carlo method in the mean-field and cluster approximations. The
phase
transition
temperatures calculated by the Monte Carlo method (1920 K for PbSc1/2Ta1/2O3 and 1810 K for PbSc1/2Nb1/2O3) are consistent with the experimental data (1770 and 1450 K, respectively). The thermodynamic properties of the cation ordering are investigated using the Monte Carlo method. (c) 2005 Pleiades Publishing, Inc.
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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Зиненко, Виктор Иванович
}
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11.
Abramova, G. M.
Metal-insulator
transition
, magnetoresistance, and magnetic properties of 3d-sulfides (Review) / G. M. Abramova, G. A. Petrakovskii> // Low Temp. Phys. - 2006. -
Vol. 32
,
Is. 8-9
. - P. 725-734 ; Физика низких температур,
DOI
10.1063/1.2219495. - Cited References: 74 . - ISSN 1063-777X
РУБ
Physics, Applied
Рубрики:
GIANT-MAGNETORESISTANCE
PHASE
-
TRANSITION
ALPHA-MNS
COLOSSAL MAGNETORESISTANCE
SINGLE-CRYSTALS
FES-MNS
SULFIDES
FERROMAGNETISM
SEMICONDUCTORS
TEMPERATURE
Аннотация:
The results of a study of the transport and magnetic properties of some sulfides of 3d elements are reported. The concentration transitions with a change of conductivity type and a change of magnetic order are considered, and the features of the colossal magnetoresistance in FexMn1-xS and CuVxCr1-xS2 solid solutions are discussed.
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Держатели документа:
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok 660036, Russian Federation
Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Абрамова, Галина Михайловна
}
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12.
Na-23 NMR in
the relaxor ferroelectric Na1/2Bi1/2TiO3 / I. P. Aleksandrova [et al.]> // Phys. Solid State. - 2006. -
Vol. 48
: 17th All-Russia Conference on the Physics of Ferroelectrics (VKS-XVII) (JUN 26-JUL 01, 2005, Penza, RUSSIA),
Is. 6
. - P. 1120-1123,
DOI
10.1134/S106378340606031X. - Cited References: 8 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
NEUTRON-SCATTERING
PHASE
-
TRANSITION
NA0.5BI0.5TIO3
Аннотация:
The Na-23 NMR spectra of a Na1/2Bi1/2TiO3 crystal are studied at frequencies of 79.4 and 15.7 MHz in the temperature range 150-720 K. It is revealed that, at all temperatures, the crystal contains regions with a nearly cubic matrix and polar clusters. The temperature dependence of the local distortion of the Na environment in the clusters is determined. The dynamics of the reorientation of the local cluster polarization in the tetragonal and trigonal NBT phases is analyzed.
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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Ioffe Physicotech Inst, St Petersburg 194021, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russian Federation
Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Ivanov, Y. N.; Иванов, Юрий Николаевич; Sukhovskii, A. A.; Суховский, Андрей Андреевич; Vakhrushev, S. B.
}
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13.
Simultaneous antiferromagnetic Fe3+
and Nd3+ ordering in NdFe3((BO3)-B-11)(4) / P. . Fischer [et al.]> // J. Phys.: Condens. Matter. - 2006. -
Vol. 18
,
Is. 34
. - P. 7975-7989,
DOI
10.1088/0953-8984/18/34/010. - Cited References: 20 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
PHASE
-
TRANSITION
DIFFRACTION
CRYSTALS
GDFE3(BO3)(4)
SINQ
Кл.слова (ненормированные):
Iron compounds
--
Magnetic moments
--
Magnetization
--
Neodymium compounds
--
Neutron diffraction
--
Vectors
--
Crystal-field effects
--
Free ion moment
--
Specific heat measurements
--
Symmetry analysis
--
Antiferromagnetic materials
Аннотация:
By means of magnetic susceptibility and specific heat measurements, x-ray and unpolarized neutron diffraction investigations on powder and single-crystal samples, simultaneous long-range antiferromagnetic Fe and Nd ordering in NdFe3((BO3)-B-11)(4) with R32 chemical structure has been found at temperatures below T-N = 30.5(5) K down to 1.6 K. At temperatures down to 19 K the propagation vector is k(hex) = [0, 0, 3/2] and becomes slightly incommensurate at lower temperatures. Combined with symmetry analysis, best powder neutron profile fits are obtained with magnetic spiral configurations with the magnetic moments oriented parallel to the hexagonal basal plane according to the irreducible representations tau(3) in the commensurate case. This is in agreement with the easy directions of magnetization perpendicular to the c-axis as determined by magnetic susceptibility measurements. At 1.6 K the magnetic Fe moment amounts to 4.9 mu(B) B close to the free ion moment of Fe3+. The magnetic Nd3+ moment saturates presumably due to crystal-field effects at 2.7 mu(B).
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Держатели документа:
ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Physik Department E21, TU Munchen, D-85748 Garching, Germany
Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Fischer, P.; Pomjakushin, V.; Sheptyakov, D.; Keller, L.; Janoschek, M.; Roessli, B.; Schefer, J.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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14.
Metal-insulator
transition
in
FexMn1-xS crystals / G. M. Abramova [et al.]> // JETP Letters. - 2007. -
Vol. 86
,
Is. 6
. - P. 371-374,
DOI
10.1134/S0021364007180051. - Cited References: 15 . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
ALPHA-MNS
PHASE
-
TRANSITION
SULFIDES
Аннотация:
Results of an experimental study of MnS, FeS, and FexMn1-xS single crystals are presented. The
phase
composition, the lattice parameters, and the state of paramagnetic ions in FexMn1-xS have been determined by x-ray diffraction analysis and Mossbauer spectroscopy. A sequence of transitions have been found in iron manganese sulfide with x = 0.29 at temperatures T-1 approximate to 25-50 K, T-2 approximate to 125 K, and T-3 approximate to 190 K with a change in kinetic properties and the formation of a metallic state at low temperatures T approximate to 2 K. The possibility of a Mott-Hubbard
transition
in FexMn1-xS sulfides with variation of the composition and the temperature is discussed.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Novosibirsk 630090, Russia
Osaka Univ, Toyonaka, Osaka 5608531, Japan
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090, Russian Federation
Osaka University, Toyonaka, Osaka 560-8531, Japan
Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Volkov, N. V.; Волков, Никита Валентинович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Mita, Y.; Bayukov, O. A.; Баюков, Олег Артемьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. A.; Sokolov, V. V.; Bovina, A. F.; Бовина, Ася Федоровна
}
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15.
Magnetoelastic coupling in
the triangular lattice antiferromagnet CuCrS2 / JCE Rasch [et al.]> // Phys. Rev. B. - 2009. -
Vol. 80
,
Is. 10
. - Ст. 104431,
DOI
10.1103/PhysRevB.80.104431. - Cited References: 30. - We are grateful for support and allocated beam time at the Institut Laue-Langevin (D1A, IN3),Grenoble, France, the spallation neutron source SINQ (TriCS, DMC) and the SLS-MS beamline, both Paul Scherrer Insitut, Villigen, Switzerland. This work was supported by INTAS Grant No. 06-1000013-9002 of the Russian Academy of Science (RAS), Siberian Branch. . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
NEUTRON POWDER DIFFRACTION
MAGNETIC-STRUCTURE
STRUCTURAL-PROPERTIES
PHASE
-
TRANSITION
SOLID OXYGEN
ALPHA-PHASES
BETA-PHASES
SELENIDES
SULFIDES
Аннотация:
CuCrS2 is a triangular lattice Heisenberg antiferromagnet with a rhombohedral crystal structure. We report on neutron and synchrotron powder diffraction results which reveal a monoclinic lattice distortion at the magnetic
transition
and verify a magnetoelastic coupling. CuCrS2 is therefore an interesting material to study the influence of magnetism on the relief of geometrical frustration.
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Держатели документа:
[Rasch, Julia C. E.
Boehm, Martin
Ritter, Clemens
Mutka, Hannu] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
[Rasch, Julia C. E.
Schefer, Juerg
Keller, Lukas] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[Cervellino, Antonio] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
[Abramova, Galina M.] SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Loeffler, Joerg F.] ETH, Dept Mat, Lab Met Phys & Technol, CH-8093 Zurich, Switzerland
ИФ СО РАН
Institut Laue-Langevin, 6 Rue Jules Horowitz, 38042 Grenoble Cedex 9, France
Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
L.V. Kirensky Institute of Physics, SB, RAS, Krasnoyarsk 660036, Russian Federation
Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
Доп.точки доступа:
Rasch, JCE; Boehm, M.; Ritter, C.; Mutka, H.; Schefer, J.; Keller, L.; Abramova, G. M.; Абрамова, Галина Михайловна; Cervellino, A.; Loffler, J. F.; Russian Academy of Science (RAS), Siberian Branch [06-1000013-9002]
}
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16.
Spin-crossover-induced Mott
transition
and the other scenarios of metallization in 3d(n) metal compounds / I. S. Lyubutin [et al.]> // Phys. Rev. B. - 2009. -
Vol. 79
,
Is. 8
. - Ст. 85125,
DOI
10.1103/PhysRevB.79.085125. - Cited References: 41 . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
RARE-EARTH ORTHOFERRITES
NARROW ENERGY BANDS
HIGH-PRESSURE
MAGNETIC COLLAPSE
ELECTRON CORRELATIONS
PHASE
-
TRANSITION
STATE
Y3FE5O12
OXIDES
EQUATION
Кл.слова (ненормированные):
bismuth compounds
--
Hubbard model
--
localised states
--
metal-insulator
transition
--
metallisation
--
spin systems
Аннотация:
A different "Hubbard energy control" mechanism of the insulator-metal
transition
(IMT) in Mott-Hubbard insulators is discussed. This mechanism can be initiated by the lattice compression and it is driven by a spin crossover of 3d(5) ions from the high-spin state to the low-spin state. The spin crossover suppresses the effective Hubbard parameter U-eff down to the value enabling the insulator-metal
transition
according to the Mott mechanism U-eff/W approximate to 1. The classification of possible scenarios of metallization in the other 3d(n) metal compounds is also performed.
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Держатели документа:
[Lyubutin, I. S.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Ovchinnikov, S. G.] Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
[Gavriliuk, A. G.] RAS, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
[Struzhkin, V. V.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
ИФ СО РАН
Institute of Crystallography, Russian Academy of Sciences, Leninsky Pr. 59, Moscow 119333, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute for High Pressure Physics, RAS, Troitsk, Moscow Region, Russian Federation
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States
Доп.точки доступа:
Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavriliuk, A. G.; Struzhkin, V. V.
}
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17.
Evolution of the
optical absorption spectra and electronic structure of the VBO3 crystal under high pressures / N. V. Kazak [et al.]> // J. Exp. Theor. Phys. - 2009. -
Vol. 109
,
Is. 3
. - P. 455-465,
DOI
10.1134/S1063776109090118. - Cited References: 27. - We would like to thank A. D. Vasil'ev for performing the X-ray diffraction investigations.This study was supported by the Russian Foundation for Basic Research (project nos. 07-02-00490a, 08-02-00897a, 08-02-90708 mob_st, 09-02-00171a, and 07-02-00226), the Federal Agency for Science and Innovation (Rosnauka) (project no. MK-4278.2008.2, contract no. 01.164.12.HB11), and the Branch of Physical Sciences of the Russian Academy of Sciences within the framework of the program "Strongly Correlated Electrons." . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
BAND-STRUCTURE
PHASE
-
TRANSITION
FEBO3
FE1-XVXBO3
STATE
MODEL
Кл.слова (ненормированные):
Charge-transfer excitations
--
D-d transitions
--
Ferromagnetic semiconductor
--
Fundamental absorption edge
--
High pressure
--
Optical absorption spectrum
--
Absorption
--
Boron
--
Boron compounds
--
Electronic properties
--
Electronic structure
--
Optical materials
--
Oxygen
--
Vanadium
--
Light absorption
Аннотация:
The evolution of optical absorption spectra of the ferromagnetic semiconductor VBO3 under high pressures up to 70 GPa has been investigated. It has been revealed that, below the fundamental absorption edge (E (g1) = 3.02 eV), the spectra exhibit a series of bands V1 (2.87 eV), V2 (2.45 eV), V3 (1.72 eV), and V4(1.21 eV) due to the d-d transitions in the V3+ ion and charge-transfer excitations. A model of the electronic structure of the VBO3 semiconductor has been constructed. This model combines the one-electron description of the s and p states of boron and oxygen and the many-electron description of the vanadium d states.
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Публикация на русском языке
Эволюция спектров оптического поглощения и электронной структуры в кристалле VBO[3] при воздействии высоких давлений [Текст] / Н. В. Казак [и др.] // Журн. эксперим. и теор. физ. - 2009. - Т. 136 Вып. 3. - С. 531-542
Держатели документа:
[Kazak, N. V.
Ovchinnikov, S. G.
Edel'man, I. S.
Rudenko, V. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Gavriliuk, A. G.
Lyubutin, I. S.] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 119333, Russia
[Gavriliuk, A. G.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Oblast, 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
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow 119333, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast 142190, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk 660041, Russian Federation
Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Gavriliuk, A. G.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Lyubutin, I. S.; Edel'man, I. S.; Edelman, I. S.; Rudenko, V. V.; Руденко, Валерий Васильевич; Russian Foundation for Basic Research [07-02-00490a, 08-02-00897a, 08-02-90708 mob_st, 09-02-00171a, 07-02-00226]; Federal Agency for Science and Innovation [MK-4278.2008.2, 01.164.12.HB11]; Russian Academy of Sciences
}
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18.
Long-Range Chemical Interaction
in Solid-State Synthesis: The Formation of a CuAu Alloy in Au/beta-Co(001)/Cu(001) Epitaxial Film Structures / V. G. Myagkov [et al.]> // JETP Letters. - 2009. -
Vol. 90
,
Is. 2
. - P. 111-115,
DOI
10.1134/S0021364009140069. - Cited References: 25. - This work was supported by Russian Foundation for Basic Research ( project no. 07-03-00190) and the Ministry of Education and Science of the Russian Federation ( program "Development of the Scientific Potential of Higher Education"). . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
THIN-FILMS
PHASE
-
TRANSITION
DIFFUSION
MICROSTRUCTURE
INTERLAYER
INTERFACE
COSI2
AU
Аннотация:
The effect of an inert Co layer (0, 210, 480 nm) on the chemical interaction between Cu and Au in Au/beta-Co(001)/Cu(001) epitaxial films has been investigated by X-ray diffraction, nuclear magnetic resonance, photoelectron spectroscopy, and magnetic structure measurements. Mixing at interfaces in Cu/beta-Co(001) and Au/beta-Co(001) bilayer films has not been revealed up to a temperature of 600 C. The solid-state synthesis of ordered CuAu| and CuAu|| phases occurs through the Co inert buffer layer in Au/beta-Co(001)/Cu(001) trilayer film systems with an increase in the annealing temperature. The initiation temperatures of the CuAu| and CuAu|| phases increase only slightly with the thickness of the Co buffer layer. The assumption of the long range of the chemical interaction between Cu and Au through the chemically inert Co layer is justified using the performed investigations.
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Держатели документа:
[Myagkov, V. G.
Mal'tsev, V. K.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Mikhlin, Yu. N.
Bondarenko, G. N.] Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia
[Bykova, L. E.] Siberian State Aerosp Univ, Krasnoyarsk, Russia
ИФ СО РАН
ИХХТ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Mikhlin, Y. N.; Bykova, L. E.; Быкова, Людмила Евгеньевна; Mal'tsev, V. K.; Maltsev, V. K.; Bondarenko, G. N.; Бондаренко, Галина Николаевна; Russian Foundation for Basic Research [07-03-00190]; Ministry of Education and Science of the Russian Federation
}
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19.
Metal–semiconductor
transition
in
SmxMn1−xS solid solutions / S. S. Aplesnin [и др.]> // Phys. Status Solidi B. - 2012. -
Vol. 249
,
Is. 4
. - P. 812-817,
DOI
10.1002/pssb.201147327. - Cited References: 27. - This study was supported by the Russian Foundation for Basic Research project No 09-02-00554_a; No 09-02-92001-NNS_a; No 11-02-98018 r_sibir_a; ADTP "Development of scientific potential of the higher school" No. 2.1.1/11763. . - ISSN 0370-1972
Перевод заглавия:
Переход металл-полупроводник в твердых растворах SmxMn1−xS
РУБ
Physics + Condensed Matter
Рубрики:
Magnetic-properties
Phase
-
transition
SmS
Valence
Pressure
Crystal
Lattice
CeRhSb
Кл.слова (ненормированные):
Kondo effect
--
metal-semiconductor
transition
--
semiconductors
--
variable-valence elements
Аннотация:
The electrical resistivity of the SmxMn1−xS (0.15 ≤ x ≤ 0.25) solid solutions in the temperature range of 80–300 K was measured. Minimum and maximum in the temperature dependence of the resistivity were found, respectively, at T = 220 K for x = 0.15 and at T = 100 K for x = 0.2 compounds. This behavior is explained from the result of the mobility-edge movement, the disorder being due to elastic deformation and spin density fluctuations with short-range order. Metal–semiconductor
phase
transition
versus concentration at xc = 0.25 is observed. Resistivity is described by scattering electrons with acoustic phonon mode and with localized manganese spin. From the thermal expansion coefficient the compression of the lattice below the Néel temperature for Sm0.2Mn0.8S is found.
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Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Har'kov, A. M.; Balaev, D. A.; Балаев, Дмитрий Александрович; Gorev, M. V.; Горев, Михаил Васильевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Sokolov, V. V.; Pichugin, A.
}
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20.
Spin crossover and
Mott-Hubbard
transition
under high pressure and high temperature in the low mantle of the Earth / S. G. Ovchinnikov [et al.]> //
J. Phys.: Conf. Ser. - 2015. -
Vol. 653
. - Ст. 012095,
DOI
10.1088/1742-6596/653/1/012095. - Cited References:22 . - ISSN 1742-6588
РУБ
Physics, Applied + Physics, Multidisciplinary
Рубрики:
PHASE
-
TRANSITION
GEOMAGNETIC DATA
MAGNESIOWUSTITE
IRON
METALLIZATION
LAYER
Аннотация:
Effect of high pressure induced spin crossover on the magnetic, electronic and structural properties of the minerals forming the Earth's low mantle is discussed. The low temperature P, T
phase
diagram of ferropericlase has the quantum
phase
transition
point P = 56 GPa at T = 0 confirmed recently by the synchrotron Mossbauer spectroscopy. The LDA+GTB calculated
phase
diagram describes the experimental data. Its extension to the high temperature resulted earlier in prediction of the metallic properties of the Earth's mantle at the depth 1400 km h 1800 km. Estimation of the electrical conductivity based on the percolation theory is given. We discuss also the thermodynamic properties and structural anomalies resulting from the spin crossover and metal insulator
transition
and compare them with the experimental seismic and geomagnetic field data.
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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Ovchinnikova, T. M.; Plotkin, V. V.; Dyad'kov, P. G.; International Conference on Interaction of Intense Energy Fluxes with Matter (XXX ; 1–6 March 2015 ; Elbrus, Kabardino-Balkaria, Russia); International conference on interaction of intense energy fluxes(30 ; 2015 ; March ; 01-06)
}
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