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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sidorov K. A., Gavrichkov V. A., Nikolaev S. V., Pchelkina Z. V., Ovchinnikov S. G.
Заглавие : Effect of external pressure on the normal and superconducting properties of high-Tc cuprates
Место публикации : Phys. Status Solidi B. - 2016. - Vol. 253, Is. 3. - P.486-493. - ISSN 0370-1972, DOI 10.1002/pssb.201552465
Примечания : Cited References: 50. - We are thankful to Dr. M.M. Korshunov for useful discussions. This work was supported by RFBR Grants 13-02-01395, 14-02-00186, grant of Russian President NSh-2886.2014.2, and the Ministry of Education and Science of Russia (SibFU Government Contract for 2014-2016, No. 3085).
Предметные рубрики: HYDROSTATIC-PRESSURE
ELECTRONIC-STRUCTURE
EXCHANGE INTERACTION
HEISENBERG-MODEL
COPPER OXIDES
FERMI-SURFACE
SPIN-WAVE
Ключевые слова (''Своб.индексиров.''): cuprates--electronic structure--fermi surface--lifshitz transitions--strongly correlated electrons--superconducting properties
Аннотация: The pressure effects on the normal state electronic structure, the superexchange interaction, and the critical temperature of d-type superconductivity mediated by magnetic pairing have been studied within the multielectron hybrid scheme LDA+GTB that takes into account electron correlations in CuO2 planes. We have found the changes of the multiband p–d model parameters at 3% compression of different symmetry: (i) hydrostatic, (ii) along the c-axis, and (iii) in a–b plane. We have studied the changes of the Fermi surface under external pressure for different hole doping concentration x. In general, this effect is too small except two critical concentrations xc1≈0.15 and xc2=0.24 where the Lifshitz transitions occur with the change of the Fermi surface topology. In the vicinity of the critical concentration, we have found the giant change of the Fermi surface area up to 100% related to the pressure-induced Lifshitz transition. The effects of pressure on the antiferromagnetic coupling J and the mean-field value of Tc are obtained in a good agreement to experimental data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Fedoseev A. D.
Заглавие : Thermodynamic properties of two-layer quasi-two-dimensional antiferromagnets
Место публикации : Theor. Math. Phys.: SPRINGER, 2011. - Vol. 168, Is. 3. - P1216-1224. - ISSN 0040-5779, DOI 10.1007/s11232-011-0099-6
Примечания : Cited References: 16. - This work was supported in part by the Russian Foundation for Basic Research (Grant No. 10-02-00251), the Presidium of the Russian Academy of Sciences (Fundamental Research Program "Quantum Physics of Condensed Matter"), the Siberian Branch of the Russian Academy of Sciences (Integration Project No. 53 and Lavrentiev Competition of Youth Projects, A. D. F.), the Ministry of Education and Science of the Russian Federation (Program "Scientific and Pedagogical Personnel of Innovative Russia" for 2009-2013), and the President of the Russian Federation (Grant No. MK-1300.2011.2, A. D. F.).
Предметные рубрики: HEISENBERG-MODEL
SPIN-WAVE
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--high-temperature superconductor--tyablikov approximation--green's function--antiferromagnetism--green's function--high-temperature superconductor--tyablikov approximation
Аннотация: For two-layer quasi-two-dimensional antiferromagnets of type YBaCuO in the Tyablikov approximation, we investigate the dependences of the energy spectrum and the temperature of transition into an ordered state on both the quasi-two-dimensionality parameter and the intensity of the exchange coupling of spin moments located in two close planes. We assume that the exchange parameters inside the CuO (2) planes are much greater than the exchange parameters resulting in coupling between a spin located on a plane of an elementary cell and a spin on another plane of a different elementary cell. The obtained expressions for the N,el temperature and for the sublattice magnetic moment at zero temperature describe the dependences of these quantities on the parameters of interplane exchange interactions.
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Вид документа : Статья из журнала
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Автор(ы) : Kuz'min E. V., Ovchinnikov S. G., Singh D. J.
Заглавие : Frustrated antiferromagnetism in the Sr2YRuO6 double perovskite
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 96, Is. 6. - P1124-1130. - ISSN 1063-7761, DOI 10.1134/1.1591224
Примечания : Cited References: 20. - This work was financially supported by the Russian Foundation for Basic Research (project no. 00-02-16110), RFFI-KKFN “Enisei” (project no. 02-02-97705), INTAS (grant 01-0654), and the Quantum Macrophysics Program of the Russian Academy of Sciences.
Предметные рубрики: SPIN-WAVE
HEISENBERG-MODEL
MOTT TRANSITION
Ключевые слова (''Своб.индексиров.''): anisotropy--antiferromagnetism--magnetic moments--perovskite--thermal effects--antiferromagnctic structures--double perovskite--frustrated antiferromagnetism--heisenberg models--strontium compounds
Аннотация: The spins of Ru5+ ions in Sr2YRuO6 form a face-centered cubic lattice with antiferromagnetic nearest neighbor interaction J approximate to 25 meV. The antiferromagnetic structure of the first type experimentally observed below the Neel temperature T-N = 26 K corresponds to four frustrated spins of 12 nearest neighbors. In the Heisenberg model in the spin-wave approximation, the frustrations already cause instability of the antiferromagnetic state at T = 0 K. This state is stabilized by weak anisotropy D or exchange interaction I with the next-nearest neighbors. Low D/J similar to I/J similar to 10(-3) values correspond to the experimental T-N and sublattice magnetic moment values. (C) 2003 MAIK "Nauka/Interperiodica".
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