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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.
Lower subband splitting and superconductivity of 2D Hubbard fermions with strong intersite correlations / V. V. Val'kov, M. M. Korovushkin // Bull. Russ. Acad. Sci. Phys. - 2012. - Vol. 76, Is. 2. - P. 133-135, DOI 10.3103/S1062873812020074. - Cited References: 6. - This study was supported by Quantum Physics of Condensed Matter program of the Presidium of the Russian Academy of Sciences; the Russian Foundation for Basic Research, project np. 10-02-00251; the federal target program Scientists and Science Teachers of an Innovate Russia, 2009-2013; the Siberian Branch of the Russian Academy of Sciences, complex integration project no. 53; RF Presidential Grant MK-1300.2011.2; and the Siberian Branch of the Russian Academy of Sciences' Lavrent'ev Competition for Young Scientists. . - ISSN 1062-8738
Кл.слова (ненормированные):
Coulomb correlations -- Doping levels -- Electron structures -- Fermi state -- Hubbard -- Intersite correlation -- Mean-square fluctuations -- Spectral intensity -- Split-off band -- Subbands -- Natural sciences
Аннотация: The effect of the strong intersite Coulomb correlations on the formation of an electron structure in the Shubin-Vonsowsky model in the regime of strong one-site correlations is studied. The results reveal a split-off band of the Fermi states. The spectral intensity of this band grows with the enhancement of the doping level and is determined by the mean-square fluctuation of occupation numbers. This changes the structure of the electron density of states qualitatively. © 2012 Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Расщепление нижней подзоны и сверхпроводимость 2D-фермионов Хаббарда при сильных межузельных корреляциях [Текст] / В. В. Вальков, М. М. Коровушкин // Изв. РАН. Сер. физич. - 2012. - Т. 76 № 2. - С. 158-160

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович; International Symposium "Nanophysics and Nanoelectronics-2011" (March 2011 ; Nizhni Novgorod)
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Val'kov, V. V.
Influence of the Coulomb repulsions on the formation of the superconducting gap of the spin-polaron quasiparticles in cuprates / V. V. Val'kov, M. M. Korovushkin, A. F. Barabanov // J. Low Temp. Phys. - 2019. - Vol. 196, Is. 1-2. - P. 242–252, DOI 10.1007/s10909-018-02120-3. - Cited References: 26. - The work was supported by the program of the Presidium of the Russian Academy of Sciences No. 12 “Fundamental problems of high-temperature superconductivity,” the Russian Foundation for Basic Research (Projects Nos. 16-02-00304 and 18-02-00837) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (Projects Nos. 18-42-243002 “Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors” and 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures”), and the grant of the President of the Russian Federation (Project MK-1398.2017.2). . - ISSN 0022-2291. - ISSN 1573-7357
Кл.слова (ненормированные):
Cuprate superconductors -- Intersite Coulomb interaction -- Spin polarons -- Spin-charge correlations -- Unconventional superconductivity
Аннотация: Taking into account the real crystalline structure of the CuO2 plane and the strong spin-fermion coupling, the influence of the on-site Coulomb repulsion of holes Up and the intersite Coulomb repulsion V2 between holes located at the next-nearest-neighbor oxygen ions on the formation of the superconducting gap with the d-wave symmetry of the order parameter of the spin-polaron quasiparticles is studied. It is shown that the formation of the resulting superconducting gap within the spin-fermion model is caused by three components. The dependence of the narrowing of the superconducting gap on the values Up and V2 is analyzed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, Russia

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
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Val'kov, V. V.
Energy structure of high-temperature superconductors with the intersite Coulomb interaction / V. V. Val'kov, M. M. Korovushkin // Eur. Phys. J. B. - 2009. - Vol. 69, Is. 2. - P. 219-227, DOI 10.1140/epjb/e2009-00141-4. - Cited References: 26. - 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. 07-02-00226); the Siberian Branch of RAS (Interdisciplinary Integration project no. 53). One of authors (M. K.) would like to acknowledge the support of the Dynasty Foundation. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   SINGLE-BAND
   ELECTRON CORRELATIONS
   CU OXIDES
   J MODEL
   DERIVATION
Кл.слова (ненормированные):
Strongly correlated electron systems; heavy fermions -- Narrow-band systems; intermediate-valence solids -- Cuprate superconductors -- Strongly correlated electron systems heavy fermions -- Narrow-band systems intermediate-valence solids -- Cuprate superconductors -- Emery model -- Energy structures -- Fermi state -- Integrated density -- Root mean squares -- Spectral intensity -- Copper compounds -- Corundum -- Coulomb interactions -- Electrons -- Fermions -- High temperature superconductors -- Oxide superconductors -- Superconductivity
Аннотация: The effect of the intersite Coulomb interaction of fermions on the ground state and energy structure of high-temperature superconductors is considered within the three-band Emery model using an extended basis of the irreducible operators orthogonal on Mori. The proposed theory allows prediction of bands of the fluctuation states whose spectral intensity grows with an increase in the root-mean-square fluctuations of the occupation numbers. The increase in these fluctuations in high-temperature superconductors upon doping plays a key role in redistribution of the integrated density of the Fermi states.

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Держатели документа:
[Val'kov, V. V.
Korovushkin, M. M.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович; Russian Academy of Sciences; Russian Foundation for Basic Research [07-02-00226]; RAS; Dynasty Foundation
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Val'kov, V. V.
Effect of the intersite Coulomb interaction on chiral superconductivity at the noncollinear spin ordering / V. V. Val'kov, A. O. Zlotnikov // Phys. Solid State. - 2017. - Vol. 59, Is. 11. - P. 2120-2126, DOI 10.1134/S1063783417110300. - Cited References:18. - This study was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory, and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, projects no. 16-02-00073-a and 16-42-243057-r-mol-a and the Complex Program of the Siberian Branch of the Russian Academy of Sciences II.2P, project no. 0358-2015-002. A.O. Zlotnikov is grateful for support of the Grant of the President of the Russian Federation SP-1370.2015.5. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
TRIANGULAR LATTICE
   MAGNETIC ORDER
   COEXISTENCE
   PHASE
Аннотация: We investigate the effect of the intersite Coulomb interaction in a planar system with the triangular lattice on the structure of chiral order parameter Δ(p) in the phase of coexisting superconductivity and noncollinear 120° magnetic ordering. It has been established that the Coulomb correlations in this phase initiate the state where the quasi-momentum dependence Δ(p) can be presented as a superposition of the chiral invariants corresponding to the dx2−y2+idxy and px + ipy symmetry types. It is demonstrated that the inclusion of the Coulomb interaction shifts the Δ(p) nodal point positions and, thereby, changes the conditions for a quantum topological transition.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние межузельного кулоновского взаимодействия на киральную сверхпроводимость при наличии неколлинеарного спинового упорядочения [Текст] / В. В. Вальков, A. O. Злотников // Физ. тверд. тела. - 2017. - Т. 59 Вып. 11. - С. 2100-2106

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

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory; Krasnoyarsk Territorial Foundation for Support of Scientific and RD Activities [16-02-00073-a, 16-42-243057-r-mol-a]; Complex Program of the Siberian Branch of the Russian Academy of Sciences II.2P [0358-2015-002]; Grant of the President of the Russian Federation [SP-1370.2015.5]
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Val'kov, V. V.
Effect of interstitial Coulomb interaction on the occurrence of a gapless superconducting phase of Hubbard fermions on a triangular lattice / V. V. Val’kov, T. A. Val’kova, V. A. Mitskan // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 6. - P. 612-615, DOI 10.3103/S1062873816060393. - Cited References: 10 . - ISSN 1062-8738
Кл.слова (ненормированные):
Physics -- Concentration dependence -- Coordination sphere -- Hubbard -- Nodal points -- Quantum transitions -- Superconducting order parameters -- Superconducting phase -- Triangular lattice -- Coulomb interactions
Аннотация: The concentration dependence of the position of nodal points of a superconducting order parameter is investigated using the t–J–V model for a triangular lattice with regard to the exchange and Coulomb interactions in two coordination spheres. The conditions for a topological quantum transition are established. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние межузельного кулоновского взаимодействия на реализацию бесщелевой сверхпроводящей фазы фермионов хаббарда на треугольной решетке [Текст] / В. В. Вальков, Т. А. Валькова, В. А. Мицкан // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 6. - С. 679-682

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Val’kova, T. A.; Валькова, Татьяна Александровна; Mitskan, V. A.; Мицкан, Виталий Александрович; Вальков, Валерий Владимирович
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Triplet p-Wave Superconductivity in the Low-Density Extended Hubbard Model with Coulomb Repulsion / M. Y. Kagan [et al.] // JETP Letters. - 2011. - Vol. 93, Is. 12. - P. 725-730, DOI 10.1134/S0021364011120083. - Cited References: 42. - We acknowledge useful with A. V. Chubukov, A.S. Alexandrov, I.A. Fomin, K.I. Kugel, and V. V. Kabanov for stimulating discussions. This work was supported by the Russian Foundation for Basic Research (project nos. 11-02-00708 and 11-02-00741). M.S.M acknowledges the support of the US Department of Energy (award no. DE-FG02-08ER64623, Hofstra University Center for Condensed Matter). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   FERMI GAS
   SUPERFLUID TRANSITION
   PHASE-SEPARATION
   SYSTEMS
   TEMPERATURES
   BEHAVIOR
   LIQUID
   POINT
   STATE
Аннотация: We analyze superconducting instabilities in 3D and 2D extended Hubbard model with Coulomb repulsion between electrons on neighboring sites in the limit of low electron density (n(el) - 0) on simple cubic (square) lattice. We show that in a realistic strong-coupling case U V W (U and V are the onsite and the intersite Coulomb repulsions, respectively, and W the bandwidth) the main SC instability corresponds to the p-wave pairing and in the leading order is correctly described by the equations obtained earlier in the absence of the intersite Coulomb interaction V = 0.

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Держатели документа:
[Kagan, M. Yu.] Russian Acad Sci, Kapitza Inst Phys Problems, Moscow 119334, Russia
[Efremov, D. V.] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[Marienko, M. S.] Hofstra Univ, Dept Phys & Astron, Hempstead, NY 11549 USA
[Val'kov, V. V.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow 119334, Russian Federation
Max-Planck-Institut fur Festkorperforschung, D-70569 Stuttgart, Germany
Department of Physics and Astronomy, Hofstra University, Hempstead, NY 11549, United States
Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Kagan, M. Y.; Efremov, D. V.; Marienko, M. S.; Val'kov, V. V.; Вальков, Валерий Владимирович
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Transport properties and ferromagnetism of Co(x)Mn(1-x)Ssulfides / S. S. Aplesnin [et al.] // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 4. - P. 765-772, DOI 10.1134/S1063776108040158. - Cited References: 39 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GIANT VOLUME MAGNETOSTRICTION
   COLOSSAL MAGNETORESISTANCE
   MAGNETIC SEMICONDUCTORS
   ELECTRICAL-PROPERTIES
   ROOM-TEMPERATURE
   ALPHA-MNS
   SPINTRONICS
   TRANSITION
   FEXMN1-XS
   FIELDS
Кл.слова (ненормированные):
Coulomb interactions -- Current voltage characteristics -- Electromotive force -- Ferromagnetism -- Magnetic susceptibility -- Magnetization -- Thermoelectricity -- Transport properties -- Charge susceptibility -- External magnetic fields -- Temperature intervals -- Thermoelectromotive force -- Cobalt compounds
Аннотация: We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80-1000 K, the magnetic susceptibility and magnetization in a temperature range of T= 4.2-300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of CoxMn1 - S-x sulfides (0 <= x <= 0.4). Anomalies in the transport properties of these compounds have been found in the temperature intervals Delta T-1 = 200-270 K and Delta T-2 = 530-670 K and at T-3 similar to T-N. The temperature dependences of the magnetic susceptibility, magnetization, and resistivity, as well as the current-voltage characteristics, exhibit hysteresis. In the domain of magnetic ordering at temperatures below the Neel temperature (TN), the anti ferromagnetic CoxMn1 - xS sulfides possess a spontaneous magnetic moment that is explained using a model of the orbital ordering of electrons in the t(2g) bands. The influence of the cobalt-ion-induced charge ordering on the transport and magnetic properties of sulfides has been studied. The calculated values of the temperatures corresponding to the maxima of charge susceptibility, which are related to a competition between the on-site Coulomb interaction of holes in various subbands and their weak hybridization, agree well with the experimental data.

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Держатели документа:
[Aplesnin, S. S.
Ryabinkina, L. I.
Romanova, O. B.
Velikanov, D. A.
Balaev, A. D.
Balaev, D. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Aplesnin, S. S.
Bandurina, O. N.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Yanushkevich, K. I.
Galyas, A. I.
Demidenko, O. F.] Natl Acad Sci, Joint Inst Solid State & Semicond Phys, Minsk 220072, Byelarus
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Joint Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Romanova, O. B.; Романова, Оксана Борисовна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Yanushkevich, K. I.; Galyas, A. I.; Demidenko, O. F.; Bandurina, O. N.
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Topological superconductivity and Majorana states in low-dimensional systems / V. V. Val'kov, M. S. Shustin, S. V. Aksenov [et al.] // Phys.-Usp. - 2022. - Vol. 65, Is. 1. - P. 2-39, DOI 10.3367/UFNe.2021.03.038950. - Cited References: 320. - This review was prepared in the framework of the Russian Foundation for Basic Research (RFBR) grant 19-12-50087. Part of the presented results were obtained in the framework of RFBR projects 19-02-00348, 20-32-70059, and 20-02-00015. S V A expresses his gratitude for support through a grant from the President of the Russian Federation, MK-1641.2020.2. A O Z and M S Sh express their gratitude to the Theoretical Physics and Math ematics Advancement Foundation “BASIS”. M Yu K thanks the Program for Basic Research of the NationalResearch University Higher School of Economics for support . - ISSN 1063-7869
Кл.слова (ненормированные):
low-dimensional system -- Majorana bound state -- spin-orbit coupling -- topological invariant -- Coulomb correlations -- noncollinear magnetism -- topological superconductivity -- quantum transport
Аннотация: We discuss the properties of topologically nontrivial superconducting phases and the conditions for their realization in condensed matter, the criteria for the appearance of elementary Majorana-type excitations in solids, and the corresponding principles and experimental methods for identifying Majorana bound states (MBSs). Along with the well-known Kitaev chain and superconducting nanowire (SW) models with spin-orbit coupling in an external magnetic field, we discuss models of quasi-two-dimensional materials in which MBSs are realized in the presence of noncollinear spin ordering. For finite-length SWs, we demonstrate a cascade of quantum transitions occurring with a change in the magnetic field, accompanied by a change in the fermion parity of the ground state. The corresponding anomalous behavior of the magnetocaloric effect can be used as a tool for identifying MBSs. We devote considerable attention to the analysis of the transport characteristics of devices that contain topologically nontrivial materials. The results of studying the conductance of an Aharonov-Bohm ring whose arms are connected by an SW are discussed in detail. An important feature of this device is the appearance of Fano resonances in the dependence of conductance on the magnetic field when the SW is in a topologically nontrivial phase. We establish a relation between the characteristics of such resonances and the spatial structure of the lowest-energy SW state. The conditions for the occurrence of an MBS in the phase of the coexistence of chiral d+id superconductivity and 120-degree spin ordering are determined in the framework of the t-J-V model on a triangular lattice. We take electron-electron interactions into account in discussing the topological invariants of low-dimensional superconducting materials with noncollinear spin ordering. The formation of Majorana modes in regions with an odd value of a topological ℤ invariant is demonstrated. The spatial structure of these excitations in the Hubbard fermion ensemble is determined.

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Публикация на русском языке Топологическая сверхпроводимость и майорановские состояния в низкоразмерных системах [Текст] : обзор / В. В. Вальков, M. S. Shustin, S. V. Aksenov [и др.] // Успехи физ. наук. - 2022. - Т. 192 № 1. - С. 3-44

Держатели документа:
Kirensky Institute Of Physics, Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy Of Sciences, Krasnoyarsk, Russian Federation
National Research University Higher School of Economics, ul. Myasnitskaya 20, 101000 Moscow, Russian Federation
Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, 119334 Moscow, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Shustin, M. S.; Шустин, Максим Сергеевич; Aksenov, S. V.; Аксенов, Сергей Владимирович; Zlotnikov, A. O.; Злотников, Антон Олегович; Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Mitskan, V. A.; Мицкан, Виталий Александрович; Kagan, M. Yu.
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10.

The reason for implementation of the d–wave rather than s–wave pairing in cuprate superconductors / V. V. Val'kov [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. I2.2. - P. 122. - References: 6. - The work was supported by the RFBR, grant № 16-02-00073, 16-02-00304 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
cuprate superconductors -- spin-fermion model -- Coulomb repulsion

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; 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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11.

Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy / O. A. Bayukov [et al.] // Physica B. - 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P. 1321-1323, DOI 10.1016/j.physb.2005.01.397. - Cited References: 3 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
strongly correlated electron system -- antiferromagnets -- borates -- Antiferromagnets -- Borates -- Strongly correlated electron system -- Antiferromagnetism -- Cryostats -- Energy gap -- Magnetic moments -- Magnetic properties -- Mossbauer spectroscopy -- Optical properties -- Single crystals -- Borates -- Coulomb correlations -- Liquid helium -- Strongly correlated electron systems -- Gadolinium compounds
Аннотация: Magnetic and optical properties of GdFe3-xGax(BO3)(4) single crystals are investigated by Mossbauer and optical spectroscopy. The GdFe3(BO3)(4) multielectron band structure model is derived. A high- and low-spin crossover of Fe3+ ion, a collapse of the magnetic moment, the suppression of Coulomb correlations, and insulator-semiconductor transition are predicted. The jump of an energy gap is measured at pressure 43 GPa. (c) 2005 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia
Inst High Pressure Phys, Troitsk 142190, Russia
Inst Crystallog, Moscow 117333, Russia
Univ Liverpool, Liverpool L69 3BX, Merseyside, England
ИФ СО РАН
LV Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Institute of High Pressure Physics, 142190, Troisk, Moscow region, Russian Federation
Institute of Crystallograhy, Leninsky Av. 59, 117333, Moscow, Russian Federation
The University of Liverpool, Liverpool L69 3BX, United Kingdom

Доп.точки доступа:
Bayukov, O. A.; Баюков, Олег Артемьевич; Gavrilyuk, A. M.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluyko, A. M.; Tomas, M.; Trojan, I. A.; Kharlamova, S. A.
}
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12.

    Strong Spin-Charge Coupling and Its Manifestation in the Quasiparticle Structure, Cooper Instability, and Electromagnetic Properties of Cuprates / V. V. Val'kov [et al.] // J. Exp. Theor. Phys. - 2019. - Vol. 128, Is. 6. - P. 885-898, DOI 10.1134/S1063776119050078. - Cited References: 83. - This study was supported by the program no. 12 "Fundamental problems in high-temperature superconductivity" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research (project no. 18-02-00837), the administration of the Krasnoyarsk Krai, Krasnoyarsk Krai Foundation for Supporting the Scientific and Technical Activity under project nos. 18-42-243002 (Manifestations of spin-nematic correlations in spectral characteristics of the electronic structure and their influence on the properties of cuprate superconductors in applications), 18-42-243018 (Contact phenomena and magnetic disorder in the problem of formation and detection of topologically protected edge states in semiconducting nanostructures), and 18-42-240014 (Single-orbital effective model of an ensemble of spin-polaron quasiparticles in the problem of description of the intermediate state and pseudogap behavior of cuprate superconductors), as well as the Council for grants from the President of the Russian Federation (project nos. MK-37.2019.2 and MK-3722.2018.2). The work of A.F.B was supported by the Russian Foundation for Basic Research (project no. 19-02-00509). . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTIVITY
   INTERSITE COULOMB REPULSION
Аннотация: The Fermi excitation spectrum, the problem of Cooper instability, and the Londons magnetic field penetration depth in cuprate superconductors are considered using the unified conception based on accounting for the strong coupling between the spin of copper ions and holes at oxygen ions. This coupling leads to strong renormalization of the primary spectrum of oxygen holes with the formation of spin-polaron quasiparticles. Analysis of Cooper instability performed using the spin-polaron concept for different channels has shown that only the superconducting d-wave pairing occurs in the ensemble of spin-polaron quasiparticles, and there are no solutions corresponding to the s-wave pairing. It has been demonstrated that the superconducting d-wave pairing is not suppressed by the Coulomb repulsion of holes located at neighboring oxygen ions. This effect is due to peculiarities in the crystallographic structure of the CuO2 plane and the aforementioned strong spin-fermion coupling. As a result, such interaction of holes is omitted in the kernel of the integral equation for the superconducting order parameter with the d-wave symmetry. It has been shown the Hubbard repulsion of holes and their interaction for the second coordination sphere of the oxygen sublattice for actual intensities of the interaction do not suppress the d-wave type of superconductivity. For the spin-polaron ensemble, we have analyzed the dependence of the Londons magnetic field penetration depth on the temperature and hole concentration. It has been established that the peculiarities of this dependence are closely related to specific features of the spin-polaron spectrum.

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Публикация на русском языке

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Reshetnikov Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Moscow 108840, Russia.

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Komarov, K. K.; Комаров, Константин Константинович; Barabanov, A. F.; "Fundamental problems in high-temperature superconductivity" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research [12, 18-02-00837]; Krasnoyarsk Krai Foundation for Supporting the Scientific and Technical Activity [18-42-243002, 18-42-243018, 18-42-240014]; President of the Russian Federation [MK-37.2019.2, MK-3722.2018.2]; Russian Foundation for Basic Research [19-02-00509]
}
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13.

Stability of the superconducting dx2-y2 phase in high-Tc superconductors with respect to the intersite coulomb repulsion of holes at oxygen / V. V. Val'kov [et al.] // JETP Letters. - 2016. - Vol. 103, Is. 6. - P. 385-389, DOI 10.1134/S0021364016060114. - Cited References:28. - This work was supported by the Russian Foundation for Basic Research, project nos. 16-02-00073 and 16-02-00304. The work of D.D.M. and M.M.K. was supported by the Dynasty Foundation and the work of M.M.K. was also supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. SP-1361.2015.1). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
Hubbard-model
Spin polaron
Density
Аннотация: It has been shown that, because of the two-orbital character of the subsystem of holes located at oxygen sites and the spatial separation of this subsystem from that of spins at copper ions, the superconducting phase in high-Tc superconductors is stable with respect to the strong Coulomb repulsion of holes located at nearestneighbor oxygen sites if the order parameter has the dx2−y2 symmetry. This effect is due to the symmetry characteristics of the Coulomb potential, owing to which the equation determining the Cooper pairing in the dx2−y2 channel does not include this potential.

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Публикация на русском языке Устойчивость сверхпроводящей dx2-y2-фазы ВТСП относительно межузельного кулоновского отталкивания кислородных дырок [Текст] / В. В. Вальков [и др.] // Письма в ЖЭТФ : Наука, 2016. - Т. 103 Вып. 5-6. - С. 433-437

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Moscow 142190, Russia.

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Russian Foundation for Basic Research [16-02-00073, 16-02-00304]; Dynasty Foundation; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [SP-1361.2015.1]
}
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14.

Stability of the superconducting d-wave pairing towards the Coulomb repulsions in cuprate superconductors / V. V. Val'kov [и др.] // VI International symposium on strong nonlinear vibronic and electronic interactions in solids : book of abstracts . - 2018. - P. 33

Материалы конференции

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; International symposium on strong nonlinear vibronic and electronic interactions in solids(6 ; 2018 ; April 28-May 1 ; Tartu, Estonia)
}
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15.

Stability of the superconducting d-wave pairing toward the intersite Coulomb repulsion in CuO2 plane / V. V. Val'kov [et al.] // J. Low Temp. Phys. - 2018. - Vol. 191, Is. 5-6. - P. 408-425, DOI 10.1007/s10909-018-1882-7. - Cited References: 70. - Acknowledgements The work was supported by the program of the Presidium of the Russian Academy of Sciences No. 12 “Fundamental problems of high-temperature superconductivity”, the Russian Foundation for Basic Research (RFBR) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (Projects Nos. 16-42-243057 and 16-42-240435). The work of A. F. B. was funded by RFBR (Project No. 16-02-00304). The work of M. M. K. was supported by a grant of the President of the Russian Federation (Project MK-1398.2017.2). . - ISSN 0022-2291
Кл.слова (ненормированные):
Cuprate superconductors -- Unconventional superconductivity -- Spin-charge coupling -- Spin polarons -- Intersite Coulomb interaction
Аннотация: Taking into account the real crystalline structure of the CuO2 plane and the strong spin-fermion coupling, we study the influence of the intersite Coulomb repulsion between holes on the Cooper instability of the spin-polaron quasiparticles in cuprate superconductors. The analysis shows that only the superconducting d-wave pairing is implemented in the whole region of doping, whereas the solutions of the self-consistent equations for the s-wave pairing are absent. It is shown that intersite Coulomb interaction V1 between the holes located at the nearest oxygen ions does not affect the d-wave pairing, because its Fourier transform Vq vanishes in the kernel of the corresponding integral equation. The intersite Coulomb interaction V2 of quasiparticles located at the next-nearest oxygen ions does not vanish in the integral equations, however, but it is also shown that the d-wave pairing is robust toward this interaction for physically reasonable values of V2.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.
}
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16.

Stability of the d-wave pairing with respect to the intersite Coulomb repulsion in cuprate superconductors / V. V. Val'kov [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 123-126, DOI 10.1016/j.jmmm.2016.12.090. - Cited References: 23. - The work was supported by the Siberian Branch of Russian Academy of Sciences (project no. 0358-2015-0002, Complex Program II.2P), the Russian Foundation for Basic Research (RFBR) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (projects nos. 16-42-240435 and 16-42-243057). The work of A.F.B. was funded by RFBR (project no. 16-02-00304). The work of M.M.K. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2). . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
HUBBARD-MODEL
EXCITATIONS
Кл.слова (ненормированные):
Cuprate superconductors -- Spin-fermion model -- Intersite Coulomb repulsion
Аннотация: Within the spin-fermion model for cuprate superconductors, the influence of the intersite Coulomb interactions V2 and V′2V′2 between holes located at the next-nearest-neighbor oxygen ions of CuO2 plane on the implementation of the dx2−y2dx2−y2-wave pairing is studied. It is shown that d-wave pairing can be suppressed only for unphysically large values of V2 and V′2V′2.
В рамках спин-фермионной модели для купратных сверхпроводников изучено влияние межузельных кулоновских отталкиваний V2 и V2' между дырками, находящимися на следующих за ближайшими ионах кислорода CuO2-плоскости, на реализацию сверхпроводящего dx2y2-спаривания. Показано, что d-спаривание подавляется только при нефизически больших значениях параметров V2 и V2'.

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; 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.

Spin-polaron concept in the theory of normal and superconducting states of cuprates / V. V. Val'kov, D. M. Dzebisashvili, M. M. Korovushkin, A. F. Barabanov // Phys. Usp. - 2021. - Vol. 64, Is. 7. - P. 641-670, DOI 10.3367/UFNe.2020.08.038829. - Cited References: 328. - The authors' study was supported by the Russian Foundation for Basic Research (RFBR) within project nos. 18-02-00837, 19-02-00509, and 20-32-70059, and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund within project no. 18-42-240014 "Single-orbital effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors.'' The review was carried out with support from the RFBR within the Expansion competition (project no. 19-12-50116) . - ISSN 1063-7869. - ISSN 1468-4780

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
CHARGE-DENSITY-WAVE
HIGH-TEMPERATURE SUPERCONDUCTORS
Кл.слова (ненормированные):
strongly correlated electron systems -- high-temperature superconductivity -- spin polarons -- intersite Coulomb interaction -- London penetration depth
Аннотация: The review discusses the emergence of the spinfermion model of cuprates and the formation of the spin-polaron concept of the electronic structure of hole-doped cuprate superconductors. This concept has allowed describing the properties of cuprates in the normal phase as well as the features of superconducting pairing in the unified approach. The derivation of the spin-fermion model from the Emery model in the regime of strong electronic correlations is described, demonstrating the appearance of strong coupling between the spins of copper ions and holes on oxygen ions. Such a strong interaction against the background of the singlet state of the spin subsystem of copper ions (quantum spin liquid) leads to the formation of special Fermi quasiparticlesDnonlocal spin polarons. Under doping, the spin-polaron ensemble exhibits instability with respect to superconducting d-wave pairing, whereas superconducting swave pairing is not implemented. At the optimal doping, the transition to the superconducting phase occurs at temperatures corresponding to experimental data. It is shown that the superconducting d-wave pairing of spin-polaron quasiparticles is not suppressed by the Coulomb repulsion of holes located on neighboring oxygen ions. It is emphasized that, when the spectral characteristics of spin-polaron quasiparticles are taken into account, the calculated temperature and doping dependences of the London penetration depth are in good agreement with experimental data.

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Публикация на русском языке Спин-поляронная концепция в теории нормального и сверхпроводящего состояний купратов [Текст] / В. В. Вальков, Д. М. Дзебисашвили, М. М. Коровушкин, А. Ф. Барабанов // Успехи физ. наук. - 2021. - Т. 191 № 7. - С. 673-704

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Prosp Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660037, Russia.
Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Kaluzhskoe Shosse 14, Moscow 108840, Russia.

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [18-02-00837, 19-02-00509, 20-32-70059]; Government of Krasnoyarsk Region; Krasnoyarsk Region Science and Technology Support Fund [18-42-240014]; RFBRRussian Foundation for Basic Research (RFBR) [19-12-50116]
}
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18.

Shustin, M. S.
Effect of strong intersite Coulomb interaction on the topological properties of a superconducting nanowire / M. S. Shustin, S. V. Aksenov // Phys. Solid State. - 2022. - Vol. 64, Is. 13. - P. 2047-2053, DOI 10.21883/PSS.2022.13.53972.23s. - Cited References: 55. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science, projects nos. 20-42-243001 and 20-42-243005. M.S.S. thanks the Foundation for the Advancement of Theoretical Physics and Mathematics ”BASIS“. S.V.A. is grateful to the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project No. MK-1641.2020.2 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
superconducting nanowires -- Majorana zero modes -- strong electron correlations
Аннотация: For superconducting nanowire with the pairing of extended s-type symmetry, Rashba spin-orbit interaction in a magnetic field, the influence of strong intersite charge correlations on single-particle Majorana excitations is analyzed. This problem is investigated on the basis of the density matrix renormalization group numerical method. It is shown that with an increase in the repulsion intensity of electrons located at the neighboring sites, two subbands emerge in the lower Hubbard band of the open system. Based on calculations of the Majorana polarization and degeneracy of the entanglement spectrum, it was found that a topologically nontrivial phase with one edge state survives at the edge of each of the subbands where the concentration of electrons or holes is minimal.

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Публикация на русском языке Шустин, Максим Сергеевич. Влияние сильного межузельного кулоновского взаимодействия на топологические свойства сверхпроводящей нанопроволоки [Текст] / М. С. Шустин, С. В. Аксенов // Физ. тверд. тела. - 2021. - Т. 63 Вып. 11. - С. 1758-1765

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Шустин, Максим Сергеевич
}
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19.

Sandalov, I. S.
Periodical anderson model and electron-phonon interaction / I. S. Sandalov // Int. J. Mod. Phys. B. - 1993. - Vol. 7, Is. 1-3. - P. 62-66, DOI 10.1142/S0217979293000160. - Cited References: 8 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
STRONGLY CORRELATED SYSTEMS
COULOMB INTERACTION
LATTICE THEORY
Аннотация: The periodical Anderson model (PAM) is microscopically derived. It is shown that the PAM is a mean field theory for the electric potential. The mixing interaction (MI) consists of single- and two- particle contributions. The first is proportional to the overlap integral of localized and band wave functions and vanishes when band energies are on the Fermi surface. It leads to the absence of heavy-fermion effects in the theories based on the PAM with only this mixing term. Using the orthogonal basis this term vanishes only at zero temperature. Applicability of the Luttinger theorem to systems with strongly-correlated electrons (SSCE) is discussed. The phonon dynamic matrix and electron-phonon interaction (EPI) for SSCE are microscopically derived.

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Держатели документа:
UNIV UPPSALA,INST PHYS,CONDENSED MATTER THEORY GRP,S-75105 UPPSALA,SWEDEN
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Сандалов, Игорь Семёнович; International Conference on the Physics of Transition Metals(1992 ; Jul ; 20-24 ; Darmstadt, Germany)
}
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20.

Sandalov, I. S.
Coulomb interaction and lattice theory of strongly correlated systems .2. dynamic matrix, electron-boson and effective electron-electron interactions / I. S. Sandalov, V. I. Filatjev // Physica B. - 1990. - Vol. 162, Is. 2. - P. 161-171, DOI 10.1016/0921-4526(90)90047-X. - Cited References: 13 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Filatjev, V. I.; Сандалов, Игорь Семёнович
}
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