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    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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Kolovsky, A. R.
Energetically constrained co-tunneling of cold atoms / A. R. Kolovsky, J. Link, S. Wimberger // New J. Phys. - 2012. - Vol. 14. - Ст. 75002, DOI 10.1088/1367-2630/14/7/075002. - Cited References: 18. - The present project was supported by the Excellence Initiative (Enable Fund of the Faculty of Physics and Astronomy, Heidelberg University). Moreover, SW acknowledges financial support from the DFG through FOR760, the Helmholtz Alliance Program of the Helmholtz Association (contract number HA-216: Extremes of density and temperature: cosmic matter in the laboratory), and by the Heidelberg Graduate School of Fundamental Physics (grant number GSC 129/1) and AK acknowledges support from the Russian Foundation for Basic Research (project number 12-02-000094-a: Tunneling of the macroscopic quantum states) and by the Siberian Branch of RAS (project no. 29: Dynamics of atomic Bose-Einstein condensates in optical lattices). AK is very grateful for the hospitality of the Institute of Theoretical Physics of Heidelberg University. . - ISSN 1367-2630

РУБ Physics, Multidisciplinary
Рубрики:
LATTICE
Аннотация: We study under-barrier tunneling for a pair of energetically bound bosonic atoms in an optical lattice with a barrier. We identify the conditions under which this exotic molecule tunnels as a point particle with the coordinate given by the bound pair center of mass and discuss the atomic co-tunneling beyond this regime. In particular, we quantitatively analyze resonantly enhanced co-tunneling, where two interacting atoms penetrate the barrier with higher probability than a single atom.

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Держатели документа:
[Kolovsky, Andrey R.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Kolovsky, Andrey R.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Link, Julia
Wimberger, Sandro] Univ Heidelberg, Inst Theoret Phys, D-69120 Heidelberg, Germany

Доп.точки доступа:
Link, J.; Wimberger, S.; Коловский, Андрей Радиевич
}
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Val'kov, V. V.
On the implementation of the coexistence phase of antiferromagnetism and superconductivity in heavy-fermion intermetallides / V. V. Val'kov, A. O. Zlotnikov // JETP Letters. - 2012. - Vol. 95, Is. 7. - P. 350-356, DOI 10.1134/S0021364012070089. - Cited References: 29. - This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Mesoscopic and Disordered Structures"), the Russian Foundation for Basic Research (project nos. 10-02-00251 and 11-02-98007-Siberia), and the Ministry of Education and Science of the Russian Federation (federal program "Human Capital for Science and Education in Innovative Russia" for 2009-2013). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
QUANTUM-CRITICAL-POINT
   CRITICAL PRESSURE
   CERHIN5
   LATTICE
Аннотация: The region of the state diagram in which the pressure-induced quantum phase transition occurs with the destruction of the antiferromagnetic ordering and the appearance of the superconductivity has been described within the periodic Anderson model. It has been shown that a microscopically homogeneous coexistence phase of antiferromagnetism and superconductivity is implemented in the vicinity of the critical point, which was experimentally found in the heavy-fermion compound CeRhIn5. In this region, the pressure increase is accompanied by the experimentally observed strong growth of the effective fermion mass.

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Публикация на русском языке Вальков, Валерий Владимирович. О реализации фазы сосуществования антиферромагнетизма и сверхпроводимости в тяжелофермионных интерметаллидах [Текст] / В. В. Вальков, A. O. Злотников // Письма в Журн. эксперим. и теор. физ. : Санкт-Петербургская издательская фирма "Наука" РАН, 2012. - Т. 95 Вып. 7.- P.390-396

Держатели документа:
[Val'kov, V. V.
Zlotnikov, A. O.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia
[Val'kov, V. V.] Siberian State Aerosp Univ, Krasnoyarsk, Russia

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
}
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Zobov, V. E.
Quantum and classical correlations in the solid-state NMR free induction decay / V. E. Zobov, A. A. Lundin // Appl. Magn. Reson. - 2014. - Vol. 45, Is. 11. - P. 1169-1177, DOI 10.1007/s00723-014-0562-2. - Cited References: 16 . - ISSN 0937-9347. - ISSN 1613-7507

РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy
Рубрики:
LATTICE
SPINS
Аннотация: The free induction decay (FID) of the transverse magnetization in a dipolar-coupled rigid lattice is a fundamental problem in magnetic resonance and in the theory of many-body systems. As it was shown earlier the FID shapes for the systems of classical magnetic moments and for quantum nuclear spin ones coincide if there are many nearly equivalent nearest neighbors n in a solid lattice. In this paper, we reduce a multispin density matrix of above system to a two-spin matrix. Then we obtain analytic expressions for the mutual information and the quantum and classical parts of correlations at the arbitrary spin quantum number S, in the high-temperature approximation. The time dependence of these functions is expressed via the derivative of the FID shape. To extract classical correlations for S 1/2 we provide generalized POVM measurement (positive-operator-valued measure) using the basis of spin coherent states. We show that in every pair of spins the portion of quantum correlations changes from 1/2 to 1/(S + 1) when S is growing up, and quantum properties disappear completely only if S → ∞.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
RAS, NN Semenov Inst Chem Phys, Moscow 117977, Russia

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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Val'kov, V. V.
EFFECTIVE INTERACTIONS IN THE PERIODIC ANDERSON MODEL IN THE REGIME OF MIXED VALENCY WITH STRONG CORRELATIONS / V. V. Val'kov, D. M. Dzebisashvili // Theor. Math. Phys. - 2008. - Vol. 157, Is. 2. - P. 1565-1576, DOI 10.1007/s11232-008-0130-8. - Cited References: 19. - This work was supported in part by the Russian Foundation for Basic Research (Grant No. 07-02-00226), a program of the Branch of Physical Sciences, Russian Academy of Sciences, and the "Integration Project" of the Siberian Branch, Russian Academy of Sciences. . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
LATTICE
Кл.слова (ненормированные):
periodic Anderson model -- mixed valency -- heavy fermion -- effective Hamiltonian -- superconductivity -- Effective Hamiltonian -- Heavy fermion -- Mixed valency -- Periodic Anderson model -- Superconductivity
Аннотация: For the periodic Anderson model in the strong correlation regime, we construct the effective Hamiltonian H(eff) up to terms of the fourth order in the parameter V/U, where V is the hybridization interaction intensity and U is the intra-atom Coulomb repulsion strength. This Hamiltonian contains interactions inducing both magnetic ordering and Cooper instability under conditions of a mixed valency of rare-earth ions. Based on numerical calculations, we obtain information about the dependences of the effective interaction parameters on the distance between crystal lattice sites. We demonstrate that realizing exchange interactions corresponds to a strongly frustrated system of localized spin moments and facilitates the suppression of the antiferromagnetic order parameter with a possible transition to the state of a quantum spin liquid. It is essential that among the terms in H(eff) inducing the transition to the superconductivity phase, there are terms resulting in the d-type symmetry of the superconductivity order parameter; such a symmetry is realized in many heavy-fermion compounds.

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Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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Val'kov, V. V.
Spin-Fluctuation Renormalization of the Temperature of a Superconducting s-Phase in Rare-Earth Intermetallides / V. V. Val'kov, D. M. Dzebisashvili // J. Exp. Theor. Phys. - 2008. - Vol. 107, Is. 4. - P. 679-691, DOI 10.1134/S1063776108100166. - Cited References: 34. - This study was supported in part by the Russian Foundation for Basic Research ( project no. 07-02-00226), the Department of Physic of the Russian Academy of Sciences ( within the program "Strongly Correlated Electrons in Semiconductors, Superconductors, and Magnetic Materials"), and the Siberian Branch of the Russian Academy of Sciences ( integration project no. 3.4). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
HEAVY-FERMION SUPERCONDUCTORS
   PERIODIC ANDERSON MODEL
   WAVE SUPERCONDUCTIVITY
   PERTURBATION-THEORY
   MECHANISM
   VALENCE
   SYSTEMS
   LATTICE
   STATE
Кл.слова (ненормированные):
Differential equations -- Electric conductivity -- Green's function -- Numerical analysis -- Rare earth elements -- Spin dynamics -- Spin fluctuations -- Anomalous components -- Critical temperatures -- Experimental datums -- Infinite systems -- Numerical calculations -- Order parameters -- Periodic Anderson models -- Renormalization -- S-phase -- Skutterudite -- Strong electron correlations -- Sub systems -- Superconducting states -- Superconductivity
Аннотация: A theory of the superconducting state with s-type symmetry of the order parameter ( the transition to this state was observed in recently discovered heavy-fermion skutterudite LaFe(4)P(12)) is developed using the periodic Anderson model in the limit of strong electron correlations. Exact representations of Green's functions of the superconducting phase via the normal and anomalous components of the mass and strength operators are obtained. It is shown that an important role in the description of this superconducting phase is played by the anomalous components of the strength operator, which reflect spin-fluctuation processes in the localized subsystem. These components are calculated in the one-loop approximation using the solution of an infinite system of integral equations of self-consistency for the superconducting phase. Numerical calculations show that allowance for the process of scattering on spin fluctuations leads to renormalization of the critical temperature and provides agreement with the experimental data.

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Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Val'kov, V. V.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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Martynov, S. N.
Frustration mechanism of formation of a helical magnetic structure in the CuB2O4 two-subsystem antiferromagnet / S. N. Martynov, A. D. Balaev // JETP Letters. - 2007. - Vol. 85, Is. 12. - P. 649-654, DOI 10.1134/S0021364007120132. - Cited References: 21 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
PHASE 10 K
COPPER METABORATE
LATTICE
Аннотация: A new mechanism is proposed for forming an incommensurate magnetic structure of the transverse helix type owing to the removal of frustration through intersubsystem exchange in a two-subsystem antiferromagnet. The symmetry analysis of the distribution of the Dzyaloshinskii-Moriya interaction and comparison with the experimental data on the field dependence of magnetization indicate that antisymmetric exchange and competition between symmetric exchanges cannot be responsible for forming a helical magnetic structure in CuB2O4.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Мартынов, Сергей Николаевич
}
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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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Kuz'min, E. V.
Effect of frustrations on magnetism in the Ru double perovskite Sr2YRuO6 / E. V. Kuz'min, S. G. Ovchinnikov, D. J. Singh // Phys. Rev. B. - 2003. - Vol. 68, Is. 2. - Ст. 24409, DOI 10.1103/PhysRevB.68.024409. - Cited References: 24 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
MOTT TRANSITION
   LATTICE
   SPIN
   ANTIFERROMAGNETISM
   SUPERCONDUCTIVITY
   FERROMAGNETISM
Аннотация: Localized Ru5+ spins in Sr2YRuO6 form a fcc lattice with an antiferromagnetic (AFM) nearest-neighbor (NN) coupling J approximate to 25 meV and rather low Neel temperature T-N= 26 K. Analysis of the electronic structure of Sr2RuO4 results in the effective Heisenberg model. We have studied the effect of frustrations on the AFM type-I structure of Sr2YRuO6 in the spin-wave approximation. In the model with only NN coupling the AFM state is unstable due to frustrations, and T-N = 0. Stabilization of the AFM state occurs due to the next-nearest-neighbor coupling I or due to the magnetic anisotropy D. Very small values D/J similar to I/J less than or equal to 10(-3) are enough to obtain the experimental values of T-N and sublattice magnetization m = 1.85 mu(B) /Ru (62% from the nominal S = 3/2 value).

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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Singh, D. J.
}
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10.

Korshunov, M. M.
Generalization of Luttinger's theorem for strongly correlated electron systems / M. M. Korshunov, S. G. Ovchinnikov // Phys. Solid State. - 2003. - Vol. 45, Is. 8. - P. 1415-1422, DOI 10.1134/1.1602872. - Cited References: 19. - The authors are grateful to V.V. Val’kov for helpful remarks. This work was supported by the INTAS (grant no. INTAS-01-0654), the Russian Foundation for Basic Research and the Krasnoyarsk KraÏ Science Foundation (program “EniseÏ,” project no. 02-02-97705), the program of the Russian Academy of Sciences “Quantum Macrophysics,” and the Russian Academy of Sciences, Siberian Division (Lavrent’yev Contest for Youth Projects) . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
NARROW ENERGY BANDS
   HUBBARD-MODEL
   FERMI-SURFACE
   LATTICE
Аннотация: By on the analyzing the general structure of the Green function of a strongly correlated electron system, it is shown that, for the regime of strong correlations, Luttinger's theorem should be generalized in the following way: the volume of the Fermi surface of the system of noninteracting particles is equal to that of the quasiparticles in the strongly correlated system with due regard for the spectral weight of the quasiparticles. An investigation of the t-J model and of the Hubbard model, as applied to the paramagnetic nonsuperconducting phase, shows that the generalized Luttinger theorem is valid for these models. (C) 2003 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Коршунов, Максим Михайлович. Обобщение теоремы Латтинжера для систем с сильными электронными корреляциями [Текст] / М. М. Коршунов, С. Г. Овчинников // Физ. тверд. тела. - 2003. - Т. 45 Вып. 8. - С. 1351-1357

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:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Коршунов, Максим Михайлович
}
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11.

Aplesnin, S. S.
Influence of quantum fluctuations on the Neel temperature of a dilute two-dimensional anisotropic antiferromagnet / S. S. Aplesnin // Phys. Solid State. - 1997. - Vol. 39, Is. 5. - P. 800-802, DOI 10.1134/1.1130121. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
LATTICE
Аннотация: A quantum Monte Carlo procedure is used to calculate the energy, sublattice magnetization, Neel temperature, and the slopes of the S=[l/T-N(x=0)]dT(N)(x)/dx curves as functions of the hole concentration and the exchange anisotropy Delta=1-J(x,y)/J(z) in the Heisenberg model with anisotropic negative interactions between nearest neighbors in a square lattice with dilution among the lattice sites. The slope diverges in the limit Delta--0:S similar to ln(6.5/Delta). (C) 1997 American Institute of Physics.

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Держатели документа:
L. V. Kirenskii Inst. of Phys., Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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12.

GEKHT, R. S.
MAGNETIC-STRUCTURES AND PROPERTIES OF STATES IN STRONGLY FRUSTRATED HEISENBERG ANTIFERROMAGNETS / R. S. GEKHT // Zhurnal Eksperimentalnoi Teor. Fiz. - 1992. - Vol. 102, Is. 6. - P. 1968-1982. - Cited References: 23 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITIONS
   SPIN
   LATTICE
   MODELS
   LONG
Аннотация: The magnetic structures and properties of states in frustrated Heisenberg antiferromagnets are analyzed. It is shown that frustrations induced due to additional spins in the system lead to a large variety of phase with the commensurable and uncommensurable periods and also to arising nonperiodical phases. The energy spectrum of states is studied. It is found that in the large region of the frustration parameter variation the modulated phase (0, Q) is unstable. The phase diagram of states is found and the region of local degeneration for some structures is indicated.

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13.

GEKHT, R. S.
ON MAGNETIC STATES IN STRONGLY FRUSTRATED 2-DIMENSIONAL ANTIFERROMAGNETICS / R. S. GEKHT, V. V. GRISHIN // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 11. - P. 3557-3559. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
LATTICE

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK,RUSSIA
ИФ СО РАН

Доп.точки доступа:
GRISHIN, V. V.
}
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14.

    Zobov, V. E.
    On the concentration dependence of wings of spectra of spin correlation functions of diluted heisenberg paramagnets / V. E. Zobov, M. M. Kucherov // JETP Letters. - 2016. - Vol. 103, Is. 11. - P. 687-691, DOI 10.1134/S0021364016110138. - Cited References:26 . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
HIGH-TEMPERATURES
   AUTOCORRELATION FUNCTION
   SINGULAR POINT
   SYSTEMS
   TIME
   COORDINATE
   LATTICE
Аннотация: Singular points of the autocorrelation function on the imaginary time axis that is averaged over the location of spins in the magnetically dilute spin lattice with isotropic spin-spin interaction at a high temperature have been studied. For the autocorrelation function in the approximation of the self-consistent fluctuating local field, nonlinear integral equations have been proposed which reflect the separation of the inhomogeneous spin systems into close spins and other spins. The coordinates of the nearest singular points have been determined in terms of the radius of convergence of the expansion in powers of time, the coefficients of which have been calculated from recurrence equations. It has been shown that the coordinates of singular points and, consequently, the wings of the autocorrelation function spectrum at strong magnetic dilution are determined by the modulation of the local field by the nearest pairs of spins leading to its logarithmic concentration dependence.

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Публикация на русском языке Зобов, Владимир Евгеньевич. О концентрационной зависимости крыльев спектров спиновых корреляционных функций разбавленных гейзенберговских парамагнетиков [Текст] / В. Е. Зобов, М. М. Кучеров // Письма В ЖЭТФ. - Москва : Наука, 2016. - Т. 103 Вып. 11-12. - С. 780-784

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Space & Informat Technol, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Kucherov, M. M.; Зобов, Владимир Евгеньевич
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15.

Val'kov, V. V.
Manifestation of spin-charge fluctuations in the spectral and thermodynamic properties of quasi-two-dimensional rare-earth intermetallic compounds / V. V. Val'kov, A. O. Zlotnikov // Low Temp. Phys. - 2017. - Vol. 43, Is. 2. - P. 191-199, DOI 10.1063/1.4977211. - Cited References:35. - This work was supported by RFBR (Grants Nos. 16-02-00073-a and 15-42-04372-r-Siberia-a), the Government of the Krasnoyarsk Region and the Regional Science Foundation (Ext. Agreement No. 07/16), as well as the Integrated program II.2P of SB RAS (Project No. 0358-2015-0002). One of the authors (A.O.Z.) acknowledges the support by the Presidential scholarships for young PhDs (SP-1370.2015.5). . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
PERIODIC ANDERSON MODEL
   INTERMEDIATE-VALENCE COMPOUNDS
   MAGNETIC PHASE-DIAGRAM
   HEAVY
   SUSCEPTIBILITY
   APPROXIMATION
   ANTIFERROMAGNETISM
   SUPERCONDUCTIVITY
   LATTICE
   METALS
Аннотация: In the framework of the modified periodic Anderson model with exchange interaction in the subsystem of localized states, it is shown that spin-charge fluctuations in quasi-two-dimensional intermetallic compounds with rare-earth ions in the mixed valence state significantly affect both the spectrum of magnetic excitations and the conditions at which the antiferromagnetic phase is realized. The spectral characteristics of the phase were obtained by the method of the diagram technique for Hubbard operators in the one-loop approximation, which allows to account for the spincharge fluctuation contributions to the components of the mass and the force operators. The developed theory allowed to quantitatively describe the pressure dependence of the Neel temperature observed in a quasi-two-dimensional antiferromagnetic heavy-fermion intermetallic compound CeRhIn5. Published by AIP Publishing.

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Публикация на русском языке Вальков, Валерий Владимирович. Проявление спин-зарядовых флуктуаций в спектральных и термодинамических свойствах квазидвумерных редкоземельных интерметаллидов [Текст] / В. В. Вальков, A. O. Злотников // Физ. низк. температур : Физико-технический институт низких температур им. Б. И. Веркина НАН Украины, 2017. - Т. 43 Вып. 2. - С. 233-244

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; RFBR [16-02-00073-a, 15-42-04372-r-Siberia-a]; Government of the Krasnoyarsk Region; Regional Science Foundation [07/16]; Integrated program II.2P of SB RAS [0358-2015-0002]; Presidential scholarships for young PhDs [SP-1370.2015.5]
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16.

Komarov, K. K.
Effective indirect multi-site spin-spin interactions in the s-d(f) model / K. K. Komarov, D. M. Dzebisashvili // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 57-59, DOI 10.1016/j.jmmm.2016.12.075. - Cited References:21. - The work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research (project nos. 16-42-240435, and 16-42-243057). The work of K.K. Komarov was supported by the grant of the President of the Russian Federation (Project MK-1398.2017.2). . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
BIQUADRATIC EXCHANGE
LATTICE
Кл.слова (ненормированные):
s-d(f) exchange model -- Mult i-site spin-spin interactions
Аннотация: Using the diagram technique for Matsubara Green's functions it is shown that the dynamics of the localized spin subsystem in the s-d(f) model can be described in terms of an effective spin model with multi-site spin-spin interactions. An exact representation of the action for the effective purely spin model is derived as an infinite series in powers of s-d(f) exchange interaction J. The indirect interactions of the 2nd, 3rd and 4th order are discussed.

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Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Комаров, Константин Константинович; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240435, 16-42-243057]; Russian Federation [MK-1398.2017.2]; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk)Институт физики им. Л.В. Киренского Сибирского отделения РАН
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17.

Val'kov, V. V.
Dynamicalmagnetic susceptibility in the spin-fermion model for cuprate superconductors / V. V. Val'kov, D. M. Dzebisashvili // Theor. Math. Phys. - 2017. - Vol. 193, Is. 3. - P. 1853-1864, DOI 10.1134/S004057791712011X. - Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073), the Administration of Krasnoyarsk Kray and the Krasnoyarsk Kray Foundation for Scientific and Technical Progress (Grant No. 16-42-240435), and the complex program No. II.2P of the Siberian Branch of the Russian Academy of Sciences (Grant No. 0356-2015-0405). . - ISSN 0040-5779. - ISSN 1573-9333

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
T-J MODEL
   LONG-RANGE-ORDER
   POLARON
   CUO2
   EXCITATIONS
   LATTICE
   WAVE
Кл.слова (ненормированные):
high-temperature conductor -- spin-fermion model -- magnetic susceptibility -- spin polaron
Аннотация: Using the method of diagram techniques for the spin and Fermi operators in the framework of the SU(2)-invariant spin-fermion model of the electron structure of the CuO2plane of copper oxides, we obtain an exact representation of the Matsubara Green’s function D⊥(k, iω m ) of the subsystem of localized spins. This representation includes the Larkin mass operator ΣL(k, iω m ) and the strength and polarization operators P(k, iω m ) and Π(k, iω m ). The calculation in the one-loop approximation of the mass and strength operators for the Heisenberg spin system in the quantum spin-liquid state allows writing the Green’s function D⊥(k, iω m ) explicitly and establishing a relation to the result of Shimahara and Takada. An essential point in the developed approach is taking the spin-polaron nature of the Fermi quasiparticles in the spin-fermion model into account in finding the contribution of oxygen holes to the spin response in terms of the polarization operator Π(k, iω m ).

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Публикация на русском языке Вальков, Валерий Владимирович. Динамическая магнитная восприимчивость в спин-фермионной модели купратных сверхпроводников [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Теор. и мат. физика. - 2017. - Т. 193 Вып. 3. - С. 515-529

Держатели документа:
RAS, Siberian Branch, Fed Res Ctr, Kirensky Inst Phys,KSC, Krasnoyarsk, Russia.
Siberian State Aerosp Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-02-00073]; Krasnoyarsk Kray Foundation for Scientific and Technical Progress [16-42-240435]; Siberian Branch of the Russian Academy of Sciences [II.2P, 0356-2015-0405]; Administration of Krasnoyarsk Kray
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18.

    Influence of the diagonal and off-diagonal electron-phonon interactions on the formation of local polarons and their band structure in materials with strong electron correlations / E. I. Shneyder [et al.] // J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 5. - P. 683-698, DOI 10.1134/S1063776118050059. - Cited References: 58. - We are grateful to V.I. Zinenko and V.A. Gavrichkov for useful discussions. This work was financially supported by the Russian Foundation for Basic Research (project no. 16-02-00098) and the Basic Research Program no. 12 of the Presidium of the Russian Academy of Sciences ("Fundamental Problems of High-Temperature Superconductivity"). . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   D-WAVE SUPERCONDUCTIVITY
   LATTICE
Аннотация: For systems with strong electron correlations and strong electron–phonon interaction, we analyze the electron–phonon interaction in local variables. The effects of the mutual influence of electron–electron and electron–phonon interactions that determine the structure of local Hubbard polarons are described. Using a system containing copper–oxygen layers as an example, we consider the competition between the diagonal and off-diagonal interactions of electrons with the breathing mode as the polaron band structure is formed within a corrected formulation of the polaron version of the generalized tight-binding method. The band structure of Hubbard polarons is shown to depend strongly on the temperature due to the excitation of Franck–Condon resonances. For an undoped La2CuO4 compound we have described the evolution of the band structure and the spectral function from the hole dispersion in an antiferromagnetic insulator at low temperatures with the valence band maximum at point (π/2, π/2) to the spectrum with the maximum at point (π, π) typical for the paramagnetic phase. The polaron line width at the valence band top and its temperature dependence agree qualitatively with angle-resolved photoemission spectroscopy for undoped cuprates.

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Публикация на русском языке Влияние диагонального и недиагонального электрон-фононных взаимодействий на формирование локальных поляронов и их зонной структуры в веществах с сильными электронными корреляциями [Текст] / Е. И. Шнейдер [и др.] // Журн. эксперим. и теор. физ. - 2018. - Т. 153 Вып. 5. - С. 820-837

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Akad Gorodok 50, Krasnoyarsk 660036, Russia.
Federal State Autonomous Higher-Education Enterprise Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Makarov, I. A.; Макаров, Илья Анатольевич; Zotova, M. V.; Зотова, Мария Владимировна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [16-02-00098]; Basic Research Program of the Presidium of the Russian Academy of Sciences [12]
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