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Aksenov, S. V.
Strong Coulomb interactions in the problem of Majorana modes in a wire of the nontrivial topological class BDI / S. V. Aksenov, A. O. Zlotnikov, M. S. Shustin // Phys. Rev. B. - 2020. - Vol. 101, Is. 12. - Ст. 125431, DOI 10.1103/PhysRevB.101.125431. - Cited References: 60. - We acknowledge fruitful discussions with V. V. Valkov and V. A. Mitskan. The reported study was funded by the RAS Presidium programs for fundamental research Nos. 12 and 32, Russian Foundation for Basic Research (Projects No. 18-32-00443 and No. 19-02-00348), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: "Coulomb interactions in the problem of Majorana modes in low-dimensional systems with nontrivial topology" (Grant No. 19-42-240011). S.V.A. and A.O.Z. are grateful to the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, Projects No. MK-1641.2020.2 and No. MK-3594.2018.2. S.V.A. acknowledges the support from the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" (Grant No. 18-46-007). . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
QUANTUM
   POLARIZATION
   TRANSITION
   FERMIONS
   SPECTRUM
   STATE
Аннотация: In this study, the problem of strong Coulomb interactions in topological superconducting wire is analyzed by means of the density-matrix-renormalization-group (DMRG) approach. To analyze properties of edge states in the BDI-class structure, a quantity called Majorana polarization is used. From its dependence on wire length and an entanglement-spectrum degeneracy, topological phase diagrams are obtained. The DMRG calculations for the Shubin-Vonsovsky-type model of the wire show the transformation of phases with Majorana single and double modes (MSMs and MDMs, respectively) under the increase of onsite and intersite correlations. In particular, we demonstrate different scenarios including the possibilities of both induction and suppression of the MSMs and MDMs. It is shown that in the strongly correlated regime, the contributions of single-particle excitations to the Majorana-type states significantly decrease at low magnetic fxields. Moreover, the t-J*-V model is derived allowing to study the effective interactions and improve the DMRG numerics. It is found out that in the limiting case of the effective Hamiltonian with infinitely strong onsite repulsion, t model, the topological phases are destroyed. Finally, the ways to probe the MSMs and MDMs via the features of caloric functions are discussed.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Shustin, M. S.; Шустин, Максим Сергеевич; Аксенов, Сергей Владимирович; RAS Presidium programs for fundamental research [32, 12]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-32-00443, 19-02-00348]; Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [19-42-240011]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific SchoolsLeading Scientific Schools Program [MK-1641.2020.2, MK-3594.2018.2]; Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" [18-46-007]
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Alekseev, K. N.
Strange attractor in resonant tunneling / K. N. Alekseev, G. P. Berman, D. K. Campbell // Phys. Rev. B. - 1998. - Vol. 58, Is. 7. - P. 3954-3962, DOI 10.1103/PhysRevB.58.3954. - Cited References: 38 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
INTRINSIC BISTABILITY
   RING CAVITY
   OPTICAL TURBULENCE
   TRANSMITTED LIGHT
   QUANTUM-WELLS
   OSCILLATIONS
   BARRIERS
   SYSTEM
   STATE
   TIME
Аннотация: We consider the process of resonant electron tunneling through a double-barrier potential, taking into account nonlinear dynamical effects generated by charge accumulation in the interbarrier space. We use the perturbation approach of Davydov and Ermakov, which was developed for investigating intrinsic bistability in resonant tunneling. For incoming electron flow, which is modulated slowly in time, we show that the resulting nonlinear dynamics can become chaotic, with the chaos described (because of the open nature of the system) by a strange attractor. We determine the conditions for the existence of this strange attractor and estimate characteristic experimental parameters for its observation.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
Univ Calif Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA
Univ Illinois, Dept Phys, Urbana, IL 61801 USA
ИФ СО РАН

Доп.точки доступа:
Berman, G. P.; Campbell, D. K.
}
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Altin, S.
Magnetization loops and pinning force of Bi-2212 single-crystal whiskers / S. . Altin, D. M. Gokhfeld // Physica C. - 2011. - Vol. 471, Is. 7-8. - P. 217-221, DOI 10.1016/j.physc.2011.01.006. - Cited References: 40. - The work is supported by Project No. 7 of RAS Program "Quantum physics of condensed matter", Grant No. 13 of Lavrentyev competition of young researchers of SB RAS and Scientific and Technical Research Council of Turkey (TUBITAK) under Contract No. TUBITAK-109T747. . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
T-C SUPERCONDUCTORS
   HIGH-TEMPERATURE SUPERCONDUCTORS
   JOSEPHSON VORTICES
   GROWTH
   BI2SR2CACU2O8+DELTA
   DENSITY
   STATE
   FIELD
   MELT
Кл.слова (ненормированные):
Bi-2212 -- Whisker -- Magnetization loop -- Pinning force -- Extended critical state model -- Bi-2212 -- Extended critical state model -- Magnetization loop -- Pinning force -- Whisker -- Bi-2212 -- Extended critical state model -- Magnetization loop -- Pinning force -- Whisker -- Flux pinning -- Magnetic fields -- Magnetization -- Critical current density (superconductivity)
Аннотация: Dependence of magnetization on applied magnetic field for single-crystal Bi-2212 whiskers was measured at different temperatures. Symmetric and asymmetric magnetization loops were successfully described by the extended critical state model (the extended Valkov-Khrustalev model). Pinning force of whiskers was investigated. (C) 2011 Elsevier B.V. All rights reserved.

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Держатели документа:
[Gokhfeld, D. M.] LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
[Altin, S.] Inonu Univ, Fen Edebiyat Fak, Fiz Bolumu, Superiletkenl Arastirma Grubu, TR-44280 Malatya, Turkey
ИФ СО РАН
Inonu Universitesi, Fen Edebiyat Fakultesi Fizik Bolumu, Superiletkenlik Arastirma Grubu, 44280 Malatya, Turkey
L.V. Kirensky Institute of Physics SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович
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Aplesnin, S. S.
A study of anisotropic Heisenberg antiferromagnet with S=1/2 on a square lattice by Monte-Carlo method / S. S. Aplesnin // Phys. Status Solidi B. - 1998. - Vol. 207, Is. 2. - P. 491-498, DOI 10.1002/(SICI)1521-3951(199806)207:2491::AID-PSSB4913.0.CO;2-G. - Cited References: 24 . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
EU2CUO4
   LA2CUO4
   ORDER
   MODEL
   STATE
Аннотация: The two-dimensional (2D) Heisenberg model (J 0) with anisotropic exchange Delta = 1-J(X)/J(Z) greater than or equal to 0 and with S = 1/2 is studied by the quantum Monte-Carlo method. Energy, susceptibility, specific heat, spin-spin correlation functions, and correlation radius are calculated. The dependence of the Neel temperature T(N)/J = 2/ln(11/Delta) on the exchange anisotropy is determined. The static magnetic factor is very slowly decreased for T/J 0.4. It is assumed to realize topological excitations in the range of these temperatures. The correlation radius of the isotropic Heisenberg model is fitted by the dependence 1/xi = 2.05T(1.0(6))/exp (1.0(4)/T).The temperature behavior of the static structural magnetic factor in La(2)CuO(4) and Er(2)CuO(4) for T T(N) is in agreement with the MC calculations.

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Держатели документа:
LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Aplesnin, S. S.
Dimerization of antiferromagnetic chain with 4-spin interaction / S. S. Aplesnin // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 6. - P. 1868-1877. - Cited References: 30 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
SPIN-1/2 HEISENBERG-ANTIFERROMAGNET
   COMPETING INTERACTIONS
   MONTE-CARLO
   THERMODYNAMIC PROPERTIES
   SYSTEMS
   CUGEO3
   TEMPERATURE
   NEUTRON
   STATE
   MODEL

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}
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Aplesnin, S. S.
Quantum spin liquid in an antiferromagnet with four-spin interactions / S. S. Aplesnin // Phys. Solid State. - 1997. - Vol. 39, Is. 8. - P. 1246-1250, DOI 10.1134/1.1130054. - Cited References: 14 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MONTE-CARLO
LA2CUO4
STATE
Аннотация: A quantum Monte Carlo study of the anisotropic antiferromagnet with four-spin interaction (K) and with spin S= 1/2 on a square lattice is reported. Temperature dependences of the capacity, susceptibility, spin correlation functions, and correlation length, and field dependences of magnetization are calculated. Phase diagrams of the ground-state antiferromagnet and gap (K0) and gapless (K0) quantum spin liquids are determined in the exchange-anisotropy-four-spin-coupling-constant (K), magnetic-field (H)-temperature (T), and temperature- (T)-K planes for an exchange anisotropy of 0.1 J. (C) 1997 American Institute of Physics.

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Держатели документа:
Kirenskii Inst. of Physics, Siberian Br. Russ. Acad. of Sci., 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Aver'yanov, E. M.
Structural and thermodynamic consequencies of the interaction of conformational degrees of freedom of azomethines in the nematic phase / E. M. Aver'yanov // J. Struct. Chem. - 2014. - Vol. 55, Is. 4. - P. 605-611, DOI 10.1134/S0022476614040039. - Cited References: 21 . - ISSN 0022-4766. - ISSN 1573-8779

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
CONJUGATED POLY(AZOMETHINE)S
   TERMINAL SUBSTITUENTS
   ELECTRONIC-STRUCTURES
   FLUORINATED ANALOGS
   INTERNAL-ROTATION
   MOLECULES
   COMPOUND
   ANGLES
   STATE
   NMR
Кл.слова (ненормированные):
azomethines -- benzylideneaniline -- conformation -- steric effects of substituents -- nematic-isotropic liquid transition -- conformational polymorphism
Аннотация: The interaction of the conformational degrees of freedom of azomethines in the nematic phase, which is induced by electronic donor-acceptor properties of the terminal substituents of the benzylideneaniline core is studied. These degrees of freedom related to the rotation angles phi (k) around the bonds between the substituent and the aniline ring (phi(1)) and also between the CH=N bridge and the aniline ring (omega(2)) are characterized by the parameters Q (k) = aOE (c) cos(2)phi (k) >. It is found that the interaction of these degrees of freedom is manifested in the linear dependence Q (2)(Q (1)). Within the phenomenological theory the effect of this interaction on changes delta (k) in the Q (k) values during the nematic liquid crystal-isotropic liquid phase transition is revealed along with the temperature T (NI) and character of this transition. The derivation of previously established empirical dependences T (NI)(Q (k) ) is presented in the presence of direct and indirect steric effects of side substituents affecting the Q (k) values. A diverse combination of delta (k) signs in the nematic phase, which is a prerequisite for the conformational polymorphism of the nematic phases of azomethines, is shown.

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Публикация на русском языке Аверьянов, Евгений Михайлович. Структурные и термодинамические следствия взаимодействия конформационных степеней свободы азометинов [Текст] / Е. М. Аверьянов // Журн. структ. химии. - Новосибирск : Изд-во СО РАН, 2014. - Т. 55 № 4. - С. 641 - 647

Доп.точки доступа:
Аверьянов, Евгений Михайлович
}
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Avramov, P. V.
Effects of the intense electron correlations on the shape of x-ray CuK absorption spectra of La2-xSrxCuO4 / P. V. Avramov, S. G. Ovchinnikov // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 108, Is. 4. - P. 1479-1488. - Cited References: 28 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   EDGE STRUCTURE
   LA2CUO4
   SATELLITES
   ALPHA
   EXCITATIONS
   COPPER
   OXIDES
   STATE
   SHAKE

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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Bayukov, O. A.
Orbital ordering in CuGeO3 / O. A. Bayukov, G. A. Petrakovskii, A. F. Savitskii // Phys. Solid State. - 1998. - Vol. 40, Is. 9. - P. 1534-1539, DOI 10.1134/1.1130602. - Cited References: 25 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SPIN-PEIERLS TRANSITION
   COMPOUND CUGEO3
   DIMERIZATION
   STATE
   SUSCEPTIBILITY
   (VO)2P2O7
   LADDER
Аннотация: The combined effect of the ligand crystal field and the exchange interaction on the Cu2+ cation in CuGeO3 is examined. It is shown that, if the magnitude of the exchange interaction exceeds the splitting of the energy levels of the d(x2-y2) and d(xy) orbitals, then an alternate filling of the d orbitals along a chain (orbital ordering) is possible. This effect creates an antiferromagnetic interaction between Cu2+ pairs in 90 degrees exchange and a doubling of the lattice period. A Jahn-Teller pseudoeffect causes singletization of the ground state of the antiferromagnetic chain of Cu2+ spins. (C) 1998 American Institute of Physics. [S1063-7834(98)02609-4].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Savitskii, A. F.; Баюков, Олег Артемьевич
}
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10.

    Crystal structure and luminescence properties of green-emitting Sr1−xAl12O19:xEu2+ phosphors / B. Ma [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 5. - P. 5995-5999, DOI 10.1016/j.ceramint.2015.12.149. - Cited References: 30. - This work was supported by the National Natural Science Foundation of China (Grant nos. 51032007 and 51372232) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015024). . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства зеленого люминофора Sr1-xAl12O19:xEu2+

РУБ Materials Science, Ceramics
Рубрики:
COLOR-TUNABLE PHOSPHOR
   ENERGY-TRANSFER
   Dy3+ PHOSPHORS
   NEAR-UV
   Eu2+
   DIODES
   PHASE
   STATE
   Ce3+
Кл.слова (ненормированные):
Crystal structure -- Magnetoplumbite -- Phosphor
Аннотация: In this paper, a series of novel luminescent Sr1−xAl12O19:xEu2+ phosphors were synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, as well as the decay curves were investigated. The quenching concentration of Eu2+ in SrAl12O19 was about 0.15 (mol). Upon excitation at 378 nm, the composition-optimized Sr0.85Al12O19:0.15Eu2+ exhibited strong broad-band green emission at 530 nm with the CIE chromaticity (0.2917, 0.5736). The results indicate that Sr1−xAl12O19:xEu2+ phosphors have potential applications as green-emitting phosphors for UV-pumped white-light LEDs.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Natl Lab Mineral Mat, Beijing 100083, Peoples R China.
SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Ma, Bin; Guo, Q. F.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lv, Zhenfei; Yao, Jun; Mei, Lefu; Huang, Zhaohui
}
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11.

DFT investigation of the influence of ordered vacancies on elastic and magnetic properties of graphene and graphene-like SiC and BN structures / A. S. Fedorov [et al.] // Phys. Status Solidi B. - 2012. - Vol. 249, Is. 12. - P. 2549-2552, DOI 10.1002/pssb.201200105. - Cited References: 32. - The work was supported by The Ministry of education and science of Russia, project 14.B37.21.0163. The authors express their gratitude to the Joint Supercomputer Center, Russian Academy of Sciences, Moscow and the supercomputer center of the Moscow State University (SKIF-MGU) for the possibility of using their computer clusters to perform all calculations. . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
WALLED CARBON NANOTUBES
   INITIO MOLECULAR-DYNAMICS
   AB-INITIO
   DEFECTS
   STATE
   MONOLAYER
   POINTS
Кл.слова (ненормированные):
boron nitride -- carbon silicide -- elastic properties -- graphene -- magnetic properties -- vacancies
Аннотация: Influence of ordered monovacancies on elastic properties of graphene is theoretically investigated by density functional theory (DFT) calculations. Inverse linear dependence of the graphene Young's modulus on the concentration of vacancies has been revealed and migration rate of the vacancies has been calculated as a function of applied strain. It is shown that the migration rate can be controlled by applying various strains or temperatures. The influence of ordered monovacancies on magnetic properties of graphene as well as graphene-like hexagonal carbon silicide (2D-SiC) and the boron nitride (h-BN) structures is investigated. It is established that the presence of vacancies in all systems yields the appearance of local magnetic moment. However, in 2D-SiC structure the magnetic moment occurs only in the case of a Si vacancy. Influence of the distance between vacancies on the ferromagnetic or anti-ferromagnetic ordering for all structures is established. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Держатели документа:
[Fedorov, A. S.
Popov, Z. I.
Fedorov, D. A.] RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Eliseeva, N. S.
Serjantova, M. V.
Kuzubov, A. A.] Siberian Fed Univ, Krasnoyarsk 660028, Russia

Доп.точки доступа:
Fedorov, A. S.; Федоров, Александр Семенович; Popov, Z. I.; Попов, Захар Иванович; Fedorov, D. A.; Федоров, Дмитрий Александрович; Eliseeva, N. S.; Serjantova, M. V.; Kuzubov, A. A.; Кузубов, Александр Александрович
}
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12.

Electron transport in FeBO3 ferroborate at ultrahigh pressures / I. A. Troyan [et al.] // JETP Letters. - 2012. - Vol. 94, Is. 10. - P. 748-752, DOI 10.1134/S0021364011220115. - Cited References: 22. - This work was supported by the Russian Foundation for Basic Research (project nos. 09-02-01527-a, 09-02-00127-a, 09-02-00171-a, 11-02-00291-a, and 11-02-00636-a), by the Ministry of Education and Science of the Russian Federation (state contract nos. 16.518.11.7021 and MK-5632.2010.2), and by the Division of Physical Sciences, Russian Academy of Sciences (program "Strong Electron Correlations"). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIC COLLAPSE
TRANSITION
STATE
Аннотация: The electrical resistance of FeBO3 crystals at high and ultrahigh pressures (up to 198 GPa) and low temperatures has been measured using diamond anvil cells. It has found that in the high-pressure phase, 46 GPa ‹ P‹ 100 GPa, the activation energy E-ac decreases gradually from 0.55 to 0.3 eV according to a linear law. Its extrapolation to zero gives an estimated value of about 210 GPa for the pressure at which complete metallization is expected. However, above 100 GPa, the linear E-ac(P) dependence smoothly transforms to a nonlinear one. At the same time, the temperature dependence of the electrical resistance at fixed pressure significantly deviates from the Arrhenius activation law and does not obey the Mott law for the hopping conductivity. Experimental data demonstrate the dependence of the activation energy E-ac both on pressure and temperature. At T = 0, the gap tends to zero. Theoretical analysis shows that the decrease in E-ac upon cooling can be interpreted in terms of the transition of the low-spin FeBO3 phase to the magnetically ordered (anti-ferromagnetic) state.

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Публикация на русском языке Транспортные свойства ферро-бората FeBO3 при сверхвысоких давлениях [Текст] / И. А. Троян [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2011. - Т. 94 Вып. 10. - С. 811-815

Держатели документа:
[Troyan, I. A.
Gavrilyuk, A. G.
Lyubutin, I. S.] Russian Acad Sci, Shubnikov Inst Crystallog, Moscow 119333, Russia
[Troyan, I. A.] Max Planck Inst Chem, D-55020 Mainz, Germany
[Gavrilyuk, A. G.] Russian Acad Sci, Inst Nucl Res, Troitsk 142190, Moscow Region, Russia
[Ovchinnikov, S. G.
Kazak, N. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Troyan, I. A.; Gavrilyuk, A. G.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Lyubutin, I. S.; Kazak, N. V.; Казак, Наталья Валерьевна
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13.

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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14.

Fe nanowires in carbon nanotubes as an example of a one-dimensional system of exchange-coupled ferromagnetic nanoparticles / R. S. Iskhakov [et al.] // JETP Letters. - 2003. - Vol. 78, Is. 4. - P. 236-240, DOI 10.1134/1.1622038. - Cited References: 38 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIC-PROPERTIES
   RANDOM ANISOTROPY
   ELECTRODEPOSITED NANOWIRES
   NI NANOWIRES
   ARRAYS
   NANOCRYSTALLINE
   ALUMINA
   NICKEL
   PORES
   STATE
Аннотация: The cooperative phenomena revealed in the field and temperature dependences of the magnetization in a system of iron nanoparticles in carbon nanotubes were studied experimentally. The character of the temperature dependences of the magnetization indicates that the ferromagnetic Fe particles in carbon nanotubes are exchange-coupled. In the region where the magnetization approaches saturation, the magnetization curves reveal the power dependence DeltaM similar to H-3/2 typical for a one-dimensional system of exchange-coupled ferromagnetic nanoparticles. (C) 2003 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Div, Novosibirsk 630090, Russia
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent'eva 3, Novosibirsk, 630090, Russian Federation
Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent'eva 5, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Balaev, A. D.; Балаев, Александр Дмитриевич; Okotrub, A. V.; Kudashov, A. G.; Kuznetsov, V. L.; Butenko, Y. V.
}
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15.

Fedoseev, A. D.
Partial differential cross section of inelastic magnetic neutron scattering in the paramagnetic phase of LaCoO3 / A. D. Fedoseev // J. Exp. Theor. Phys. - 2014. - Vol. 119, Is. 3. - P. 573-578, DOI 10.1134/S1063776114090027. - Cited References: 18. - This study was supported by the Russian Foundation for Basic Research (project nos. 13-02-00523 A, 14-02-31280 mol_a, and 13-02-98013). . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
FEATURES
STATE
Аннотация: The partial differential cross section of inelastic magnetic neutron scattering from the compound LaCoO3 in the paramagnetic phase is studied theoretically. The contribution to scattering from the high-spin state of an ion in zero magnetic field and the modification of this contribution upon application of a magnetic field are calculated using the effective Hamiltonian for the 5 D term. The amplitude of the peak in the dependence of the scattering cross section on the energy of scattered neutrons, which corresponds to the transition from the low-spin to the intermediate-spin state, is estimated.

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Публикация на русском языке Федосеев, Александр Дмитриевич. Дважды дифференциальное сечение неупругого магнитного рассеяния нейтронов в парамагнитной фазе LaCoO3 [Текст] / А. Д. Федосеев // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 146 Вып. 3. - С. 651-656

Доп.точки доступа:
Федосеев, Александр Дмитриевич; Russian Foundation for Basic Research [13-02-00523 A, 14-02-31280 mol_a, 13-02-98013]
}
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16.

Gavrichkov, V. A.
Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov // Phys. Rev. B. - 2020. - Vol. 101, Is. 9. - Ст. 094409, DOI 10.1103/PhysRevB.101.094409. - Cited References: 65. - We acknowledge the support of the Russian Science Foundation through Grant No. 18-12-00022 . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
EXCHANGE INTERACTION
   PHASE-TRANSITIONS
   STATE
   ELECTRON
   IRON
Аннотация: We derived simple rules for the sign of 180° superexchange interaction based on the multielectron calculations of the superexchange interaction in the transition metal oxides that are valid both below and above spin crossover under high pressure. The superexchange interaction between two cations in dn configurations is given by a sum of partial contributions related to the electron-hole virtual excitations to the different states of the dn+1 and dn−1 configurations. Using these rules, we have analyzed the sign of the 180° superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 until d8: the iron, cobalt, chromium, nickel, copper, and manganese oxides with increasing pressure. The most interesting result concerns the magnetic state of cobalt and nickel oxides CoO, Ni2O3 and also La2CoO4, LaNiO3 isostructural to well-known high-TC and colossal magnetoresistance materials. These oxides have a spin 12 at the high pressure. Change of the interaction from antiferromagnetic below spin crossover to ferromagnetic above spin crossover is predicted for oxide materials with cations in d5(FeBO3) and d7(CoO) configurations, while for materials with the other dn configurations spin crossover under high pressure does not change the sign of the 180∘ superexchange interaction.

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Держатели документа:
Kirensky Inst Phys, Akadeingorodok 50,Bld 38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
}
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17.

General regularities and differences in the behavior of the dynamic magnetization switching of ferrimagnetic (CoFe2O4) and antiferromagnetic (NiO) nanoparticles / S. I. Popkov, A. A. Krasikov, S. V. Semenov [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 9. - P. 1518-1524, DOI 10.1134/S1063783420090255. - Cited References: 46. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk region, and the Krasnoyarsk Regional Foundation for Science, project no. 18-42-240012: "Magnetization switching of magnetic nanoparticles in strong pulsed magnetic fields is a new approach to studying the dynamic effects related to the processes of magnetization of magnetic nanoparticles" . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
PARTICLE-SIZE
   EXCHANGE-BIAS
   TEMPERATURE
   STATE
   COERCIVITY
Кл.слова (ненормированные):
CoFe2O4nanoparticles -- antiferromagnetic NiO nanoparticles -- dynamic magnetization switching -- coercive force
Аннотация: In antiferromagnetic (AFM) nanoparticles, an additional ferromagnetic phase forms and leads to the appearance in AFM nanoparticles of a noncompensated magnetic moment and the magnetic properties typical of common FM nanoparticles. In this work, to reveal the regularities and differences of the dynamic magnetization switching in FM and AFM nanoparticles, the typical representatives of such materials are studied: CoFe2O4 and NiO nanoparticles with average sizes 6 and 8 nm, respectively. The high fields of the irreversible behavior of the magnetizations of these samples determine the necessity of using strong pulsed fields (amplitude to 130 kOe) to eliminate the effect of the partial hysteresis loop when studying the dynamic magnetic hysteresis. For both types of the samples, coercive force HC at the dynamic magnetization switching is markedly higher than HC at quasi-static conditions. HC increases as the pulse duration τP decreases and the maximum applied field H0 increases. The dependence of HC on field variation rate dH/dt = H0/2τP is a unambiguous function for CoFe2O4 nanoparticles, and it is precisely such a behavior is expected from a system of single-domain FM nanoparticles. At the same time, for AFM NiO nanoparticles, the coercive force is no longer an unambiguous function of dH/dt, and the value of applied field H0 influences more substantially. Such a difference in the behaviors of FM and AFM nanoparticles is caused by the interaction of the FM subsystem and the AFM “core” inside AFM nanoparticles. This circumstance should be taken into account when developing the theory of dynamic hysteresis of the AFM nanoparticles and also to take into account their practical application.

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Публикация на русском языке Общие закономерности и различия в поведении динамического перемагничивания ферримагнитных (CoFe2O4) и антиферромагнитных (NiO) наночастиц [Текст] / С. И. Попков, А. А. Красиков, С. В. Семенов [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 9. - С. 1354-1360

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Boreskov Inst Catalisis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Yakushkin, S. S.; Kirillov, V. L.; Mart'yanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240012]
}
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18.

    Giant magnetostriction of CuGeO3 / L. . Gladczuk [et al.] // Czech. J. Phys. - 1996. - Vol. 46. - P. 1969-1970, DOI 10.1007/BF02570976. - Cited References: 10 . - ISSN 0011-4626
Рубрики:
SPIN-PEIERLS TRANSITION
   COMPOUND CUGEO3
   SYSTEM CUGEO3
   STATE
Аннотация: The magnetostriction of CuGcO(3) single crystals has been measured in the temperature range from 5 to 16 K in magnetic fields up to 12 T. Giant values of the magnetostrictive strains along the b-axis is observed near the phase transition from the dimerized phase to the high field magnetic phase. The field induced magnetostriction in the antiferromagnetic phase is considerably smaller than in the dimerized phase.

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Доп.точки доступа:
Gladczuk, L.; Szymczak, R.; Nabialck, A.; Krynetskii, I.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Szymczak, H.; International Conference on Low Temperature Physics(21 ; 1996 ; Aug. 8-14 ; Prague)
}
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19.

Golovnev, N. N.
Enrofloxacinium citrate monohydrate: Preparation, crystal structure, thermal stability and IR-characterization / N. N. Golovnev, A. D. Vasiliev, S. D. Kirik // J. Mol. Struct. - 2012. - Vol. 1021. - P. 112-117, DOI 10.1016/j.molstruc.2012.04.059. - Cited References: 22. - The authors are grateful to the Ministry of Education and Science (Government Contracts # 02.740.11.0629) for the financial support of the investigation. . - ISSN 0022-2860

РУБ Chemistry, Physical
Рубрики:
COCRYSTAL
   ANTIBACTERIAL
   BEHAVIOR
   STATE
   ACID
Кл.слова (ненормированные):
Enrofloxacin -- Citric acid -- Crystal structure -- IR spectra -- Thermal analysis
Аннотация: Enrofloxacinium citrate monohydrate (I), C19H 23FN3O3+В·C6H7O7- В·H2O, [C19H22FN3O3 - enrofloxacin, EnrH] has been crystallized from the mutual solution of citric acid and enrofloxacin in ambient conditions. The colorless crystals have been investigated using X-ray single crystal and powder techniques, and characterized by differential scanning calorimetry, thermogravimetry and infrared spectroscopy. The obtained compound can be considered as a salt with enrofloxacinium in the role of a cation and citrate as an anion. The ions ratio equals to 1:1. The compound crystallizes in the triclinic lattice with a = 9.0489(8) A, b = 9.6531(8) A, c = 14.913(1) A, ? = 98.813(1)В°, ? = 92.029(1)В°, ? = 91.013(1)В°, Z = 2, V = 1286.1(2) A3, S.G. P1?. The crystal structure determination reveals the importance of inter- and intramolecular interactions in the crystal formation. The EnrH2+andH3Cit- molecular ions are packed in alternating layers with water molecules inserted into the citrate layers. A citrate ion in the layer is linked via H-bondings with two adjacent ones and three water molecules. Enrofloxacinium cations are packaged by means of a benched mode and every cation is linked by three intermolecular thymus type H-bondings with nitrogens of adjacent cations and by two links with the oxygen of the citrate ions. The infrared spectra gave the evidence of H-bonding formation in the obtained salt. The ?-stacking interactions are observed between the aromatic cycles of the adjacent cations which are located in an antiparallel style in a layer. В© 2012 Elsevier B.V. All rights reserved.

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Держатели документа:
Siberian Federal University, Svobodny Ave. 79, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Vasiliev, A. D.; Васильев, Александр Дмитриевич; Kirik, S. D.; Головнёв, Николай Николаевич
}
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20.

Heat capacity and thermal expansion study of Ba0.9Bi0.067(Ti1-xZrx)O-3 ceramics / M. . Gorev [et al.] // J. Phys.: Condens. Matter. - 2007. - Vol. 19, Is. 34. - Ст. 346237, DOI 10.1088/0953-8984/19/34/346237. - Cited References: 15 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
BA(TI1-XZRX)O-3
STATE
Кл.слова (ненормированные):
Adiabatic calorimeters -- Temperature range -- Temperature regions -- Thermal expansion anomaly -- Barium -- Ceramic materials -- Dielectric properties -- Expansion -- Specific heat -- Zirconium -- Thermal expansion
Аннотация: For Ba0.9Bi0.067(Ti1-xZrx)O-3 (x = 0.04, 0.15) ceramics, the heat capacity C-p(T) and the thermal expansion alpha(T) were measured using an adiabatic calorimeter and an optical-mechanical dilatometer in the temperature range 100-420 K. Both compounds reveal diffuse heat capacity and thermal expansion anomalies: three anomalies in the temperature regions 150-250 K, 250-300 K (alpha(T) only) and 300-400 K at x = 0.04 and two anomalies in the regions 200 250 K and 250-350 K at x = 0.15. The results obtained are discussed together with the data on the dielectric properties.

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Держатели документа:
[Gorev, Michail
Bondarev, Vitaly
Flerov, Igor] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Maglione, Mario
Simon, Annie] Univ Bordeaux 1, CNRS, ICMCB, F-33608 Pessac, France
ИФ СО РАН
LVKirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
ICMCB-CNRS, Universite de Bordeaux i, 87 avenue ASchweitzer, 33608 Pessac, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Maglione, M.; Simon, A.
}
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