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Hirschfeld, P. J.
Gap symmetry and structure of Fe-based superconductors / P. J. Hirschfeld, M. M. Korshunov, I. I. Mazin // Rep. Prog. Phys. - 2011. - Vol. 74, Is. 12. - Ст. 124508, DOI 10.1088/0034-4885/74/12/124508. - Cited References: 312. - Wewould like to thankRArita, A V Chubukov, T P Devereaux, O Dolgov, I Eremin, R M Fernandes, S Graser, H Ikeda, A F Kemper, H Kontani, K Kuroki, T A Maier, Y Matsuda, V Mishra, K A Moler, R Prozorov, DJ Scalapino, T Shibauchi, G R Stewart, I Vekhter, W Wang, Y Wang and H-H Wen for useful discussions. Partial support was provided by DOE DE-FG02-05ER46236 (PJH and MMFK) and NSF-DMR-1005625 (PJH). MMK acknowledges support from RFBR (grant 09-02-00127), Presidium of RAS program 'Quantum physics of condensed matter' N5.7, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK P891 and GK 16.740.12.0731), and President of Russia (grant MK-1683.2010.2). PJH and MMK are grateful for the support of the Kavli Institute for Theoretical Physics and the Stanford Institute for Materials and Energy Science during the writing of this work. . - ISSN 0034-4885

РУБ Physics, Multidisciplinary
Рубрики:
D-WAVE SUPERCONDUCTORS
   DENSITY-OF-STATES
   HIGH-TEMPERATURE SUPERCONDUCTIVITY
   RESOLVED PHOTOEMISSION-SPECTROSCOPY
   IRON-BASED SUPERCONDUCTORS
   UNCONVENTIONAL SUPERCONDUCTORS
   ANISOTROPIC SUPERCONDUCTORS
   RENORMALIZATION-GROUP
   PAIRING SYMMETRY
   CUPRATE SUPERCONDUCTORS
Аннотация: The recently discovered Fe-pnictide and chalcogenide superconductors display low-temperature properties suggesting superconducting gap structures which appear to vary substantially from family to family, and even within families as a function of doping or pressure. We propose that this apparent nonuniversality can actually be understood by considering the predictions of spin fluctuation theory and accounting for the peculiar electronic structure of these systems, coupled with the likely 'sign-changing s-wave' (s(+/-)) symmetry. We review theoretical aspects, materials properties and experimental evidence relevant to this suggestion, and discuss which further measurements would be useful to settle these issues.

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Держатели документа:
[Hirschfeld, P. J.
Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Korshunov, M. M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Mazin, I. I.] USN, Res Lab, Washington, DC 20375 USA
ИФ СО РАН
Department of Physics, University of Florida, Gainesville, FL 32611, United States
L v Kirensky, Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Code 6393, Naval Research Laboratory, Washington, DC 20375, United States

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Mazin, I. I.
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Val'kov, V. V.
Splitting of the lower subband of Hubbard fermions in the Shubin-Vonsowsky model under the influence of strong intersite correlations / V. V. Val'kov, M. M. Korovushkin // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 1. - P. 108-120, DOI 10.1134/S1063776110061056. - Cited References: 26. - We express our deep gratitude to R. O. Zaitsev for numerous remarks and discussions. We are grateful to A. A. Golovnya, A. A. Shklyaev, and V. A. Mitskan for specific advice on the numerical calculations of the mass operator. This work was supported by the "Quantum Condensed Matter Physics" Program of the Presidium of the Russian Academy of Sciences, the Russian Foundation for Basic Research (project no. 10-02-00251), the "Scientific and Scientific-Pedagogical Personnel of Innovational Russian for 2009-2013" Federal Goal-Oriented Program, and the Interdisciplinary Integration Project no. 53 of the Siberian Branch of the Russian Academy of Sciences. One of us (M. K.) thanks Lavrentiev's contest of youth projects of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
NARROW ENERGY BANDS
ELECTRON CORRELATIONS
Кл.слова (ненормированные):
Cooper channels -- Cooper instability -- Density of electronic state -- Doping levels -- Electron concentration -- Energy structures -- Hubbard -- Hubbard operators -- Interaction energies -- Intersite correlation -- Mott-Hubbard insulator -- Nonuniform -- Renormalization -- Root mean squares -- Scattering amplitudes -- Spectral intensity -- Split-off band -- Strongly correlated fermions -- Sub-bands -- Doping (additives) -- Superconducting transition temperature
Аннотация: The diagram technique for Hubbard operators is used to investigate the influence of intersite Coulomb interactions on the energy structure and Cooper instability of strongly correlated fermions. Allowance for intersite correlations in doped Mott-Hubbard insulators is shown to lead to a splitting of the lower subband of Hubbard fermions and to the formation of a band of fluctuation states as soon as the intersite interaction energy becomes comparable to or exceeds the mean kinetic energy. The spectral intensity of the splitoff band is proportional to the root-mean-square fluctuation of the occupation numbers and increases with doping level. The predicted effect changes significantly the structure of the density of electronic states. This leads to a renormalization of the pole of the scattering amplitude in the Cooper channel and manifests itself as a nonuniform (in electron concentration) modification of the dependence of the critical superconducting transition temperature.

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

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович
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Val'kov, V. V.
Renormalization of Energy Structure and Oscillation Period in the de Haas-van Alphen Effect at the Strong Intersite Coulomb Interaction / V. . Val'kov, M. . Korovushkin // J. Phys. Soc. Jpn. - 2011. - Vol. 80, Is. 1. - Ст. 14703. - P., DOI 10.1143/JPSJ.80.014703. - Cited References: 36. - This study was supported by the program "Quantum Physics of Condensed Matter'' of the Presidium of the Russian Academy of Sciences (RAS), the Russian Foundation for Basic Research (project No. 10-02-00251), the Federal goal-oriented program Scientific Brainpower of the Russian Innovations 2009-2013, and the Siberian Division of RAS (Interdisciplinary Integration project No. 53). One of the authors (M. K.) would like to acknowledge the support of the Lavrentiev's Competition of the Siberian Division of RAS. The authors are grateful to the Physical Society of Japan for financial support in publication. . - ISSN 0031-9015

РУБ Physics, Multidisciplinary
Рубрики:
T-C SUPERCONDUCTOR
   EXTENDED HUBBARD-MODEL
   CUPRATE SUPERCONDUCTORS
   ELECTRON CORRELATIONS
   QUANTUM OSCILLATIONS
   FERMI-SURFACE
   OXIDES
   TEMPERATURE
   STATE
   BANDS
Кл.слова (ненормированные):
strongly correlated electron systems -- cuprate superconductors -- intersite Coulomb interaction -- t-V model -- de Haas-van Alphen effect -- Cuprate superconductors -- De Haas-van Alphen effect -- Intersite Coulomb interaction -- Strongly correlated electron systems -- T-V model
Аннотация: The effect of strong intersite Coulomb correlations on the formation of the electron structure of the t-V model has been studied. A qualitatively new result indicating the occurrence of a split-off band of Fermi states has been obtained. The spectral intensity of this band increases with an increase in doping level and is determined by the mean-square fluctuation of occupation numbers. This results in the transformation of the energy structure and the integrated density of states and in a further decrease in state occupation in the quasimomentum space near the Fermi level as compared with Hubbard renormalization. It has been shown that this effect leads to an increase in the area of the quasimomentum space part limited by the Fermi contour and is important for the analysis of the de Haas-van Alphen oscillations in cuprate superconductors.

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Держатели документа:
[Val'kov, Valery
Korovushkin, Maxim] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, Valery] Siberian Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L. V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Siberian Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович
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Val'kov, V. V.
Effect of Spin Fluctuations on the Superconducting Phase of Hubbard Fermions in the t-t'-t"-J* Model / V. V. Val'kov, A. A. Golovnya // J. Exp. Theor. Phys. - 2008. - Vol. 107, Is. 6. - P. 996-1008, DOI 10.1134/S1063776108120091. - Cited References: 33. - This work was supported by the Program "Quantum Macrophysics" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research (project no. 06.02.16100), and Integration project no. 3.4 of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPECTRUM
Кл.слова (ненормированные):
Electric conductivity -- Fermions -- Integral equations -- Spin dynamics -- Spin fluctuations -- Anomalous components -- Critical temperatures -- Electron concentrations -- Hubbard -- Hubbard operators -- Joint effects -- Large systems -- Nonhomogeneous equations -- One-loop approximations -- Order parameters -- Renormalization -- Scattering process -- Self energies -- Spin-fluctuation -- Strongly correlated electrons -- Superconducting phase -- System of integral equations -- Superconductivity
Аннотация: The effect of spin-fluctuation scattering processes on the region of the superconducting phase in strongly correlated electrons (Hubbard fermions) is investigated by the diagram technique for Hubbard operators. Modified Gor'kov equations in the form of an infinitely large system of integral equations are derived taking into account contributions of anomalous components P(0 sigma),((sigma) over bar0) of strength operator P. It is shown that spin-fluctuation scattering processes in the one-loop approximation for the t-t'-t"-J* model taking into account long-range hoppings and three-center interactions are reflected by normal (P(0 sigma), (0 sigma)) and anomalous (P(0 sigma), ((sigma) over bar0)) components of the strength operator. Three-center interactions result in different renormalizations of the kernels of the integral equations for the superconducting d phase in the expressions for the self-energy and strength operators. In this approximation for the d-type symmetry of the order parameter for the superconducting phase, the system of integral equations is reduced to a system of nonhomogeneous equations for amplitudes. The resultant dependences of critical temperature on the electron concentrations show that joint effect of long-range hoppings, three-center interactions, and spin-fluctuation processes leads to strong renormalization of the superconducting phase region.

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Держатели документа:
[Val'kov, V. V.
Golovnya, A. A.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Val'kov, V. V.
Golovnya, A. A.] Siberian State Aerosp Univ, Krasnoyarsk 660074, Russia
ИФ СО РАН
Kirenskii 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 660074, Russian Federation

Доп.точки доступа:
Golovnya, A. A.; Головня, Александр Александрович; 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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Berman, G. P.
Renormalization method for the quantum system of interacting resonances / G. P. Berman, A. R. Kolovsky // Phys. Lett. A. - 1987. - Vol. 125, Is. 4. - P. 188-192, DOI 10.1016/0375-9601(87)90095-8. - Cited References: 8 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
ИФ СО РАН
Доп.точки доступа:
Kolovsky, A. R.; Коловский, Андрей Радиевич; Берман, Геннадий Петрович
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SADREEV, A. F.
REAL-SPACE RENORMALIZATION-GROUP STUDY OF A TWO-DIMENSIONAL NONLINEAR MASSLESS FIELD / A. F. SADREEV // Phys. Lett. A. - 1984. - Vol. 100, Is. 9. - P. 477-481, DOI 10.1016/0375-9601(84)90830-2. - Cited References: 16 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

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Держатели документа:
L.V. Kirensky Institute of Physics, USSR Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
ИФ СО РАН
Доп.точки доступа:
Садреев, Алмаз Фаттахович
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Electron-Phonon Interaction and Phonon Renormalization in the Lamellar Cobaltate NaxCoO2 / A. . Donkov [et al.] // J. Supercond. Nov. Magn. - 2009. - Vol. 22: International Conference on Quantum Phenomena in Complex Matters (JUL 26-AUG 01, 2008, Erice, ITALY), Is. 1. - P. 37-40, DOI 10.1007/s10948-008-0372-6. - Cited References: 16 . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
Кл.слова (ненормированные):
Electron-phonon interaction -- Superconductivity -- Sodium cobaltate -- Electron-phonon interaction -- Sodium cobaltate -- Superconductivity -- Brillouin zones -- Cobaltate -- Conducting electrons -- Conduction electrons -- Doping dependences -- Feedback effects -- Matrix elements -- Phonon frequencies -- Phonon modes -- Raman experiments -- Renormalization -- Sodium cobaltate -- Sodium cobaltates -- Atoms -- Cobalt compounds -- Critical current density (superconductivity) -- Electric conductivity -- Electron-phonon interactions -- Electrons -- Flow interactions -- Penetration depth (superconductivity) -- Sodium -- Superconductivity -- Phonons
Аннотация: We study theoretically the electron-phonon interaction in NaxCoO2. For the A(1g) and E-1g phonon modes found in Raman experiments, we calculate the matrix elements of the electron-phonon interaction. Analyzing the feedback effect of the conduction electrons on the phonon frequency., we investigate the doping dependence of these two phonon modes. Due to the momentum dependence of the electron-phonon interaction, we find the strongest renormalization of the E-1g mode around the Brillouin zone boundary which should be observed in the neutron scattering. At the same time, the A(1g) mode shows the strongest coupling to the conducting electrons around the G point and reveals its doping dependence in the Raman experiments. Our results shed light on the possible importance of the electron-phonon interaction in the lamellar sodium cobaltates.

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Держатели документа:
[Donkov, A.
Eremin, I.
Knolle, J.
Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Eremin, I.] TU Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany
[Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, Dresden 01187, Germany
Institute fur Mathematische und Theoretische Physik, TU Braunschweig, Braunschweig 38106, Germany
Siberian Branch, Russian Academy of Sciences, L.V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Donkov, A.; Eremin, I.; Knolle, J.; Korshunov, M. M.; Коршунов, Максим Михайлович
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Val'kov, V. V.
Renormalization of triplet populations of a spin dimer in zero magnetic field with quantum transport / V. V. Val'kov, S. V. Aksenov // Low Temp. Phys. - 2019. - Vol. 45, Is. 2 : 22nd Ural International Winter School on the Physics of Semiconductors (Feb 20-23, 2018, Alapayevsk, RUSSIA). - P. 165-175, DOI 10.1063/1.5086406. - Cited References: 20. - This work was performed with the support of the Program for Fundamental Research of the Presidium of the Russian Academy of Sciences, No. 32, "Nanostructures: physics, chemistry, biology, foundations of technology", the Russian Fund for Basic Research (grants #16-02-00073, #18-32-00443), the Government of Krasnoyarsk Krai, the Krasnoyarsk Regional Fund for Science within the scientific projects: "Connected Majorana fermions in nanomaterials with strong electron correlations and quantum transport of electrons in systems based on them" (No. 17-42-240441) and "Manifestation of Coulomb interactions and the effects of limited geometry in properties of topological regional states of nanostructures from spin-orbital interaction" (No. 18-42-243017). S.A. expresses his gratitude for a grant of the President of the Russian Federation MK-3722.2018.2. . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
SINGLE-MOLECULE
Аннотация: Based on the nonequilibrium Keldysh technique in the atomic representation, the effect of inducing a varied population of magnetic states of a spin dimer interacting with electrons transported through a system in a zero magnetic field was studied. In order to find the filling numbers of the quantum states of the system under the strong nonequilibrium condition, a system of kinetic equations was derived and solved by the method of nonequilibrium diagram technique for Hubbard operators. Numerical analysis of these equations made it possible to reveal nonequilibrium renormalizations when accounting for strong spin-fermion correlations.

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Публикация на русском языке Вальков, Валерий Владимирович. Ренормировки заселенностей триплетных состояний спинового димера в нулевом магнитном поле при квантовом транспорте [Текст] / В. В. Вальков, С. В. Аксенов // Физ. низких температур / чл. прогр. ком. В. В. Вальков. - 2019. - Т. 45 Вып. 2. - С. 192-203 : 19 – 24 февраля 2018 г. : гопрограмма и тезисы докладов / чл. прогр. ком. В. В. Вальков

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Fed Res Ctr,Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович; Program for Fundamental Research of the Presidium of the Russian Academy of Sciences [32]; Russian Fund for Basic Research [16-02-00073, 18-32-00443]; Government of Krasnoyarsk Krai; Krasnoyarsk Regional Fund for Science [17-42-240441, 18-42-243017]; Russian Federation [MK-3722.2018.2]; Ural International Winter School on the Physics of Semiconductors(22nd ; Feb 20-23, 2018 ; Alapayevsk, Russia)
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10.

Spin fluctuation renormalizations of normal and superconducting state properties in t-J*-model / V. V. Val'kov, A. A. Golovnya // J. Phys. Conf. Ser. - 2010. - Vol. 200, Is. SECTION 1, DOI 10.1088/1742-6596/200/1/012050 . - ISSN 1742-6588
Кл.слова (ненормированные):
Critical temperatures -- Electron concentration -- Hubbard -- Hubbard operators -- Joint effect -- Normal phase -- One-loop approximation -- Order parameter -- Renormalization -- Scattering process -- Strongly correlated electrons -- Superconducting phase -- Superconducting state -- Distribution functions -- Mathematical operators -- Superconductivity -- Spin fluctuations
Аннотация: The effect of spin-fluctuation scattering processes on the region of the superconducting phase in the strongly correlated electrons (Hubbard fermions) has been investigated by the diagram technique for Hubbard operators. It is shown that spin fluctuations in the one-loop approximation for the t - t? - t? - J*- model taking into account long-range hoppings and three-center interactions are reflected by components of the strength operator. In this approximation for the d-type symmetry of the order parameter for the superconducting phase a system of infinite integral equations has been derived. Obtained dependencies of critical temperature on the electron concentrations show that joint effect of long-range hoppings, three-center interactions, and dynamical spin-fluctuation processes leads to strong renormalization of the superconducting phase region. It was shown that these processes essentially modify distribution functions of Hubbard fermions in normal phase. © 2010 IOP Publishing Ltd.

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Держатели документа:
Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val'kov, V.V.; Golovnya, A.A.
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