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Effect of external pressure on the normal and superconducting properties of high-Tc cuprates / K. A. Sidorov [et al.] // Phys. Status Solidi B. - 2016. - Vol. 253, Is. 3. - P. 486-493, DOI 10.1002/pssb.201552465. - 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). . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
HYDROSTATIC-PRESSURE
   ELECTRONIC-STRUCTURE
   EXCHANGE INTERACTION
   HEISENBERG-MODEL
   COPPER OXIDES
   FERMI-SURFACE
   SPIN-WAVE
Кл.слова (ненормированные):
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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Доп.точки доступа:
Sidorov, K. A.; Сидоров, Кирилл Александрович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Pchelkina, Z. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Val'kov, V. V.
Thermodynamic properties of two-layer quasi-two-dimensional antiferromagnets / V. V. Val'kov, A. D. Fedoseev // Theor. Math. Phys. - 2011. - Vol. 168, Is. 3. - P. 1216-1224, DOI 10.1007/s11232-011-0099-6. - 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.). . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
HEISENBERG-MODEL
SPIN-WAVE
Кл.слова (ненормированные):
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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Держатели документа:
[Val'kov, V. V.
Fedoseev, A. D.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Вальков, Валерий Владимирович
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Magnetic structure and magnetic excitations in the two-dimensional spin system of the Cu3B2O6 compound / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 7. - P. 1315-1320, DOI 10.1134/S1063783407070207. - Cited References: 21 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LONG-RANGE ORDER
   HEISENBERG-MODEL
   GROUND-STATE
   GAP
   ANTIFERROMAGNET
   SRCU2(BO3)(2)
   CUGEO3
   CHAINS
   CAV4O9
Аннотация: This paper reports on the results of measurements of the magnetic susceptibility, heat capacity, neutron scattering, muon spin relaxation, and electron paramagnetic resonance in Cu3B2O6 for the study of the ground state of the spin system of this compound. The results obtained suggest that, at a temperature of 10 K, the spin subsystem of the crystal, which consists of single spins and clusters of pairs and fours of spins interacting with one another, undergoes a transition to a state representing a superposition of the singlet (for clusters) and magnetically ordered (for single spins) states.

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Держатели документа:
LV Kirenskii Inst Phys, Siberian Div, Russian Acad Sci, Krasnoyarsk 660036, Russia
Paul Scherrer Inst, Villigen, Switzerland
Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Paul-Scherrer Institute, Villigen, Switzerland
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Popov, M. A.; Schefer, J.; Neidermayer, C.; Aleshkevich, P.; Szymczak, R.
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    Kuz'min, E. V.
    Frustrated antiferromagnetism in the Sr2YRuO6 double perovskite / E. V. Kuz'min, S. G. Ovchinnikov, D. J. Singh // J. Exp. Theor. Phys. - 2003. - Vol. 96, Is. 6. - P. 1124-1130, DOI 10.1134/1.1591224. - 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. . - ISSN 1063-7761
   Перевод заглавия: Фрустрированный антиферромагнетизм в двойном перовските Sr[2]YRuO[6]

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-WAVE
HEISENBERG-MODEL
MOTT TRANSITION
Кл.слова (ненормированные):
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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Публикация на русском языке Кузьмин, Евгений Всеволодович. Фрустрированный антиферромагнетизм в двойном перовските Sr[2]YRuO[6] [Текст] / Е. В. Кузьмин, С. Г. Овчинников, Д. Дж. Сингх // Журнал экспериментальной и теоретической физики. - 2003. - Т. 123 Вып. 6. - С. 1278-1285

Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
USN, Res Lab, Washington, DC 20375 USA
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Naval Research Laboratory, Washington, DC, United States

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Singh, D. J.
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Lundin, A. A.
Solid-state NMR free induction decay, simulated by the system of classical magnetic moments and quantum correlations / A. A. Lundin, V. E. Zobov // Russ. J. Phys. Chem. B. - 2021. - Vol. 15, Is. 5. - P. 839-847, DOI 10.1134/S1990793121050079. - Cited References: 34. - This study was carried out as part of state assignment 0082-2019-0001 (registration number AAAA-A19-119012890064-7) . - ISSN 1990-7931. - ISSN 1990-7923

РУБ Physics, Atomic, Molecular & Chemical
Рубрики:
HIGH-TEMPERATURE DYNAMICS
   HEISENBERG-MODEL
   SPIN SIMULATIONS
   SHAPE
Кл.слова (ненормированные):
spin -- paramagnetic -- quantum technology -- spin dynamics -- quantum computing
Аннотация: In the past decade, nuclear magnetic resonance (NMR) has been actively used to study the basic principles of quantum computers. It is assumed that quantum correlations play a significant role in their performance. They exist at both low and high temperatures. At the same time, the time correlation functions of nuclear spin systems of solids determine the observed signals in traditional NMR implementations. The separation of such signals into quantum and classical components has not previously been carried out and will be performed in this study for the most important of the correlational functions observed in magnetic resonance: the free induction decay (FID).

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Публикация на русском языке Лундин, Андрей Арнольдович. Сигнал свободной прецессии ЯМР твердого тела, его моделирование посредством системы классических магнитных моментов и квантовые корреляции [Текст] / А. А. Лундин, В. Е. Зобов // Химич. физика. - 2021. - Т. 40 № 9. - С. 41-49

Держатели документа:
Russian Acad Sci, Semenov Fed Res Ctr Chem Phys, Moscow, Russia.
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk, Russia.

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич; [AAAA-A19-119012890064-7]
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