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Decisive proofs of the s± → s++ transition in the temperature dependence of the magnetic penetration depth / V. A. Shestakov, M. M. Korshunov, Y. N. Togushova, O. V. Dolgov // Supercond. Sci. Technol. - 2021. - Vol. 34, Is. 7. - Ст. 075008, DOI 10.1088/1361-6668/abff6f. - Cited References: 40. - We are grateful to D V Efremov, A S Fedorov, S G Ovchinnikov, E I Shneyder, D Torsello, and A N Yaresko for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (RFBR) Grant No. 19-32-90109 and by RFBR and Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' Grant No. 19-42-240007. . - ISSN 0953-2048. - ISSN 1361-6668

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
ORDER-PARAMETER
   IMPURITIES
   SUPERCONDUCTORS
   STATES
   MODEL
Кл.слова (ненормированные):
unconventional superconductors -- iron pnictides -- iron chalcogenides -- impurity scattering -- penetration depth
Аннотация: One of the features of the unconventional s± state in iron-based superconductors is possibility to transform to the s++ state with the increase of the nonmagnetic disorder. Detection of such a transition would prove the existence of the s± state. Here we study the temperature dependence of the London magnetic penetration depth within the two-band model for the s± and s++ superconductors. By solving Eliashberg equations accounting for the spin-fluctuation mediated pairing and nonmagnetic impurities in the T-matrix approximation, we have derived a set of specific signatures of the s± → s++ transition: (1) sharp change in the behavior of the penetration depth λL as a function of the impurity scattering rate at low temperatures; (2) before the transition, the slope of ΔλL(T) = λL(T) - λL(0) increases as a function of temperature, and after the transition this value decreases; (3) the sharp jump in the inverse square of the penetration depth as a function of the impurity scattering rate, λL-2(Γa), at the transition; (4) change from the single-gap behavior in the vicinity of the transition to the two-gap behavior upon increase of the impurity scattering rate in the superfluid density ρs(T).

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.
Donostia Int Phys Ctr, San Sebastian 20018, Spain.

Доп.точки доступа:
Shestakov, V. A.; Шестаков, Вадим Андреевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu. N.; Тогушова Ю. Н.; Dolgov, O., V; Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [19-32-90109]; RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' [19-42-240007]
}
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    Details of the disorder-induced transition between s± and s++ states in the two-band model for Fe-based superconductors / V. A. Shestakov [et al.] // Supercond. Sci. Technol. - 2018. - Vol. 31, Is. 3. - Ст. 034001, DOI 10.1088/1361-6668/aaa501. - Cited References:62. - We are grateful to P D Grigor'ev and M V Sadovskii for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). MMK and VAS acknowledge the support of the 'BASIS' Foundation for Development of Theoretical Physics and Mathematics. . - ISSN 0953-2048. - ISSN 1361-6668
   Перевод заглавия: Детали вызванного беспорядком перехода между s± и s++ состояниями в двузонной модели сверхпроводников на основе железа

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
IRON-BASED SUPERCONDUCTORS
HIGH-TEMPERATURE SUPERCONDUCTIVITY
PAIRING
Кл.слова (ненормированные):
unconventional superconductors -- iron pnictides -- iron chalcogenides -- impurity scattering
Аннотация: IIrradiation of superconductors with different particles is one of many ways to investigate the effects of disorder. Here we study the disorder-induced transition between s ± and s ++ states in the two-band model for Fe-based superconductors with nonmagnetic impurities. Specifically, we investigate the important question of whether the superconducting gaps during the transition change smoothly or abruptly. We show that the behavior can be of either type and is controlled by the ratio of intraband to interband impurity scattering potentials, and by a parameter σ, that represents scattering strength and ranges from zero (Born approximation) to one (unitary limit). For the pure interband scattering potential and the scattering strength σ ≲ 0.11, the s ± → s ++ transition is accompanied by steep changes in the gaps, while for larger values of σ, the gaps change smoothly. The behavior of the gaps is characterized by steep changes at low temperatures, T˂ 0.1Tc0 with Tc0 being the critical temperature in the clean limit, otherwise it changes gradually. The critical temperature Tc is always a smooth function of the scattering rate in spite of the steep changes in the behavior of the gaps.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Leibniz Inst Festkorper & Werkstoffforsch, D-01069 Dresden, Germany.
Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.

Доп.точки доступа:
Shestakov, V. A.; Шестаков, Вадим Андреевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu.N.; Тогушова Ю. Н.; Efremov, D. V.; Dolgov, O. V.; Russian Foundation for Basic Research [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]; 'BASIS' Foundation for Development of Theoretical Physics and Mathematics
}
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Diagram Approach to the Problem of the Normal Phase Properties of the Spin-Polaron Ensemble in Cuprate Superconductors / V. V. Val'kov [et al.] // J. Low Temp. Phys. - 2019. - Vol. 197, Is. 1-2. - P. 34-43, DOI 10.1007/s10909-019-02211-9. - Cited References: 29. - 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) (Projects Nos. 18-02-00837 and 19-02-00509) 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,” 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures,” and 18-42-240014 “Single-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors”). . - ISSN 0022-2291
Кл.слова (ненормированные):
Cuprate superconductors -- Unconventional superconductivity -- Spin-charge correlations
Аннотация: Taking into account the real crystalline structure of the CuO 2 plane within the spin-fermion model and using the diagram technique, the spin-polaron concept of the fermionic excitations in cuprate superconductors is implemented. It is shown that an account of the on-site scattering processes leads to considerable binding energy of the spin-polaron quasiparticles. An account of the two-site spin-fermion scattering processes results in the energy spectrum and spectral properties of the spin-polaron quasiparticles which agree well with experimental data on cuprate superconductors.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Vereshchagin Institute for High Pressure Physics, Troitsk, Moscow, 108840, Russian Federation

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.
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Does magnetic scattering always suppress superconducting transition? / O. V. Dolgov [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. I2.5. - P. 125. - We acknowledge partial support by RFBR (Grant RFBR 16-02-00098) . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
unconventional superconductivity -- impurities, pnictides -- multiband systems

Доп.точки доступа:
Dolgov, O. V.; Korshunov, M. M.; Коршунов, Максим Михайлович; Golubov, A. A.; Efremov, D. V.; 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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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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Kagan, M. Y.
High-Tc and Low-Tc superconductivity in electron systems with repulsion / M. Y. Kagan, V. A. Mitskan, M. M. Korovushkin // J. Supercond. Nov. Magn. - 2016. - Vol. 29, Is. 4. - P. 1043-1048, DOI 10.1007/s10948-016-3384-7. - Cited References:31. - The authors are grateful to V. V. Val'kov, I. S. Burmistrov, M. V. Feigel'man, and A. Ya. Tzalenchuk for valuable remarks. This work is supported by the Russian Foundation for Basic Research (nos. 14-02-00058 and 14-02-31237). One of the authors (M. Yu. K.) gratefully acknowledges support from the Basic Research Program of the National Research University Higher School of Economics. Another one (M. M. K.) thanks the scholarship SP-1361.2015.1 of the President of Russia and the Dynasty foundation. . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
Fermion systems
   Doped graphene
   Hubbard-model
   Phase-diagram
   Superfluidity
   Density
Кл.слова (ненормированные):
Unconventional superconductivity -- Kohn-Luttinger mechanism -- Graphene
Аннотация: We demonstrate the instability of the normal state of purely repulsive fermionic systems towards the transition to the Kohn-Luttinger superconducting state. We construct the superconducting phase diagrams of these systems in the framework of the Hubbard and Shubin-Vonsovsky models on the square and hexagonal lattices. We show that an account for the long-range Coulomb interactions, as well as the Kohn- Luttinger renormalizations, lead to an increase in the critical superconducting temperatures in various materials, such as high-temperature superconductors, idealized monolayer, and bilayer of doped graphene. Additionally, we discuss the role of the structural disorder and the nonmagnetic impurities in superconducting properties of real graphene systems.

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Держатели документа:
PL Kapitsa Phys Problems Inst, Moscow 119334, Russia.
Natl Res Univ, Higher Sch Econ, Moscow 109028, Russia.
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
KTH Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.
Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Russian Foundation for Basic Research [14-02-00058, 14-02-31237]; Basic Research Program of the National Research University Higher School of Economics; Dynasty foundation; [SP-1361.2015.1]
}
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    Kagan, M. Yu.
    Effect of the long-range Coulomb interaction on the phase diagram of the Kohn–Luttinger superconducting state in Idealized graphene / M. Yu. Kagan, V. A. Mitskan, M. M. Korovushkin // J. Low Temp. Phys. - 2015. - Vol. - P. 1-7, DOI 10.1007/s10909-015-1427-2 . - ISSN 0022. - ISSN 1573-7357
   Перевод заглавия: Влияние межузельного кулоновского взаимодействия на фазовую диаграмму сверхпроводящего состояния Кона-Латтинжера в идеализированном графене
Кл.слова (ненормированные):
Unconventional superconductivity -- Kohn-Luttinger mechanism -- Graphene monolayer
Аннотация: The effect of the long-range Coulomb interaction on the formation of the Kohn–Luttinger superconductivity in monolayer doped graphene is studied disregarding the Van der Waals potential of the substrate and both magnetic and non-magnetic impurities. It is shown that the allowance for the Kohn–Luttinger renormalizations up to the second order in perturbation theory in the on-site Hubbard interaction inclusively, as well as in the intersite Coulomb interaction, significantly affects the interplay between the superconducting phases with the f-wave, p+ip-wave, and d+id-wave symmetries of the order parameter. It is demonstrated that taking Coulomb repulsion of electrons located at the next-nearest neighboring atoms in such a system into account changes qualitatively the phase diagram and enhances the critical temperature of the transition to the superconducting phase.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia.
MF Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
P. L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow,

Доп.точки доступа:
Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович
}
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    Korshunov, M. M.
    Comparison of experimental data on the spin resonance frequency and gap magnitudes in Fe-based superconductors / M. M. Korshunov, V. A. Shestakov, Y. N. Togushova // 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. 133-135, DOI 10.1016/j.jmmm.2016.12.082. - Cited References:73. - We would like to thank H. Kontani, S.A. Kuzmichev, T.E. Kuzmicheva, and V.M. Pudalov for useful discussions. We acknowledge partial support by RFBR (Grant 16-02-00098), and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Сравнение экспериментальных данных по частоте спинового резонанса и величины щели в сверхпроводниках на основе железа

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
RESOLVED PHOTOEMISSION-SPECTROSCOPY
INELASTIC NEUTRON-SCATTERING
Кл.слова (ненормированные):
Fe-based superconductors -- Inelastic neutron scattering -- Unconventional -- superconductivity -- Magnetic mechanism of pairing
Аннотация: Here we review experimental data on the peak in inelastic neutron scattering (INS) and superconducting gaps extracted from various experimental techniques. Comparison of energy scales gives the confidence that the observed peak in INS for most materials is the true spin resonance.

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Доп.точки доступа:
Shestakov, V. A.; Togushova, Yu. N.; Коршунов, Максим Михайлович; RFBR [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]; 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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Korshunov, M. M.
Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors / M. M. Korshunov, S. A. Kuzmichev, T. E. Kuzmicheva // Materials. - 2022. - Vol. 15, Is. 17. - Ст. 6120, DOI 10.3390/ma15176120. - Cited References: 50. - All authors acknowledge support by the state assignment of the Ministry of Science and Higher Education of the Russian Federation, nos. 0023-2019-0005 and 0287-2021-0035 . - ISSN 1996-1944
Кл.слова (ненормированные):
unconventional superconductivity -- spin-fluctuation mechanism of Cooper pairing -- spin resonance peak -- Andreev spectroscopy -- planar break-junction -- iron-based superconductors
Аннотация: Quasiparticle excitations provide viable information on the physics of unconventional superconductors. Higgs and Leggett modes are some of the classic examples. Another important bosonic excitation is the spin exciton originating from the sign-changing superconducting gap structure. Here we report a direct observation of the temperature-dependent spin exciton in the Andreev spectra of iron-based superconductors. Combined with the other experimental evidence, our observation confirms the extended s-wave (s±) order parameter symmetry and indirectly proves the spin-fluctuation mechanism of Cooper pairing.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Kuzmichev, S. A.; Kuzmicheva, T. E.; Коршунов, Максим Михайлович
}
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10.

Korshunov, M. M.
Dynamical magnetic susceptibility in the lamellar cobaltate superconductor NaxCoO2 center dot yH(2)O / M. M. Korshunov, I. . Eremin // Phys. Rev. B. - 2008. - Vol. 77, Is. 6. - Ст. 64510, DOI 10.1103/PhysRevB.77.064510. - Cited References: 49 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
UNCONVENTIONAL SUPERCONDUCTIVITY
NMR
Аннотация: We systematically analyze the influence of the superconducting gap symmetry and the electronic structure on the dynamical spin susceptibility in superconducting NaxCoO2 center dot yH(2)O within three different models: The single a(1g)-band model with nearest-neighbor hoppings, the realistic three-band t(2g) model with, and without e(g)' pockets present at the Fermi surface. We show that the magnetic response in the normal state is dominated by the incommensurate antiferromagnetic spin density wave fluctuations at large momenta in agreement with experimental temperature dependence of the spin-lattice relaxation rate. Also, we demonstrate that the presence or the absence of the e(g)' pockets at the Fermi surface does not significantly affect this conclusion. In the superconducting state our results for d(x)(2)-y(2)- or d(xy)-wave symmetries of the superconducting order parameter are consistent with experimental data and exclude nodeless d(x)(2)-y(2)+id(xy)-wave symmetry. We further point out that the spin-resonance peak proposed earlier is improbable for the realistic band structure of NaxCoO2 center dot yH(2)O. Moreover, even if present the resonance peak is confined to the antiferromagnetic wave vector and disappears away from it.

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

Доп.точки доступа:
Eremin, I.; Коршунов, Максим Михайлович
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11.

Korshunov, M. M.
Impurities in multiband superconductors / M. M. Korshunov, Y. N. Togushova, O. V. Dolgov // Physics-Uspekhi. - 2016. - Vol. 59, Is. 12. - P. 1211-1240, DOI 10.3367/UFNe.2016.07.037863. - Cited References: 200. - We acknowledge partial support by RFBR (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). . - ISSN 1063-7869
Кл.слова (ненормированные):
Unconventional superconductors -- Iron pnictides -- Iron chalcogenides -- Impurity scattering
Аннотация: Disorder impurities and defects violating the ideal long-range order is always present in solids. It can result in interesting and sometimes unexpected effects in multiband superconductors, especially if the superconductivity is uncon-ventional, thus having symmetry other than the usual s-wave. This paper uses the examples of iron-based pnictides and chal-cogenides to examine how both nonmagnetic and magnetic impurities affect superconducting states with s± and s++ order parameters. We show that disorder causes the transition between s± and s++ states and examine what observable effects this transition can produce. © 2016 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

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Публикация на русском языке Коршунов, Максим Михайлович. Примеси в многозонных сверхпроводниках [Текст] / М. М. Коршунов, Ю. Н. Тогушова, В. Г. Долгов // Успехи физ. наук : ред. журн. "Успехи физ. наук", 2016. - Т. 186 № 12. - С. 1315-1347

Держатели документа:
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Science Center SB RAS, ul. Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodnyi prosp. 79, Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Festkorperforschung, Stuttgart, Germany
Lebedev Physical Institute, Russian Academy of Sciences, Leninskii prosp. 53, Moscow, Russian Federation

Доп.точки доступа:
Togushova, Yu.N.; Тогушова, Ю. Н.; Dolgov, O. V.; Коршунов, Максим Михайлович
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12.

    Korshunov, M. M.
    Itinerant spin fluctuations in iron-based superconductors / M. M. Korshunov // Perturbation theory: advances in research and applications. - New York : Nova Science Publishers, 2018. - Chap. 2. - P. 61-137 . - ISBN 9781536129908. - ISBN 9781536129892
   Перевод заглавия: Делокализованные спиновые флуктуации в сверхпроводниках на основе железа
Кл.слова (ненормированные):
Fe-based superconductors -- Spin fluctuations -- Spin resonance peak -- Unconventional superconductivity
Аннотация: In multiband systems, it is possible to explore a variety of competing ground states. Bright examples are the Fe-based pnictides and chalcogenides, which demonstrate metallic, superconducting, and various magnetic phases. Here I discuss only one of the many interesting topics, namely, spin fluctuations in metallic multiband systems. I show how to calculate the effect of itinerant spin excitations on the electronic properties and formulate a theory of spin fluctuation-induced superconductivity. The superconducting state is unconventional and thus the system demonstrates unusual spin response with the spin resonance feature. I discuss its origin, consequences, and relation to experimental observations. Role of the spin-orbit coupling is specifically emphasized.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Коршунов, Максим Михайлович
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13.

    Liquid crystals doped with ionic surfactants for electrically induced anchoring transitions / M. N. Krakhalev, V. S. Sutormin, O. O. Prishchepa [et al.] // Unconventional liquid crystals and their applications / ed.: Wei Lee, S. Kumar. - Berlin et al. : De Gruyter, 2021. - Chap. 7. - P. 279-330DOI 10.1515/9783110584370-007. - Cited References: P. 327-330
   Перевод заглавия: Жидкие кристаллы, допированные ионными сурфактантами, для электро-индуцированных изменений сцепления

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Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН

Доп.точки доступа:
Wei Lee \ed.\; Kumar, Sandeep \ed.\; Krakhalev, M. N.; Крахалев, Михаил Николаевич; Sutormin, V. S.; Сутормин, Виталий Сергеевич; Prishchepa, O. O.; Прищепа, Оксана Олеговна; Gardymova, A. P.; Shabanov, A. V.; Шабанов, Александр Васильевич; Wei Lee; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич
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14.

Ovchinnikov, S. G.
Comparison of electronic structure, magnetic mechanism, and symmetry of pairing in ruthenates and cuprates / S. G. Ovchinnikov ; ed. C Noce [et al.] // Ruthenate and rutheno-cuprate materials: unconventional superconductivity, magnetism and quantum phase transitions. Ser. lecture notes in physics : Springer Verlag, 2002. - Vol. 603: International Conference on Ruthenate and Rutheno-Cuprate Materials (OCT 25-27, 2001, VIETRI SUL MARE, ITALY). - P. 239-255. - Cited References: 48 . - ISBN 0075-8450. - ISBN 3-540-44275-8

РУБ Physics, Multidisciplinary + Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
   SUPERCONDUCTOR SR2RUO4
   LAYERED PEROVSKITE
   BAND-STRUCTURE
   CORRELATED ELECTRONS
   MOTT TRANSITION
   COPPER OXIDES
   HUBBARD-MODEL
   RUSR2GDCU2O8
   CA2-XSRXRUO4
Аннотация: A generalized tight-binding (GTB) method is developed to calculate quasi-particle band structure with explicit account for strong electronic correlations. The GTB method combines exact diagonalization of the multi-orbital P-d model Hamiltonian within the unit cell and the perturbation theory in the Hubbard X-operators form for the inter-cell hopping and interactions. For undoped cuprates we obtain the valence band structure in excellent agreement with ARPES data, evolution of the band structure with doping with an in-gap state at small doping, impurity-like band at higher doping to optimally doped metal. The effective low-energy Hamiltonian has the form of singlet-triplet t-J model. For ruthenates the t-J-I model is proposed with both antiferromagnetic J and ferromagnetic I couplings. In the strong correlation limit, the mean-field theory of superconductivity results in d-wave singlet pairing mediated by J (cuprates) and p-wave triplet one mediated by I (ruthenates) with ratio T-c((d))/T-c((p)) similar to 100 due to the different symmetry of the gap. The competition of ferromagnetic and antiferromagnetic order in rutheno-cuprates is also discussed.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Noce, C \ed.\; Vecchione, A \ed.\; Cuoco, M \ed.\; Cuoco, \ed.\; Овчинников, Сергей Геннадьевич
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15.

    Shestakov, V. A.
    Temperature-dependent s± ↔ s++ transitions in the multiband model for Fe-based superconductors with impurities / V. A. Shestakov, M. M. Korshunov, O. V. Dolgov // Symmetry. - 2018. - Vol. 10, Is. 8. - Ст. 323, DOI 10.3390/sym10080323. - Cited References: 50. - This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098), Presidium of RAS Program for the Fundamental Studies #12, and "BASIS" Foundation for Development of Theoretical Physics and Mathematics. MMK acknowledges support by the Gosbudget program #0356-2017-0030. . - ISSN 2073-8994
   Перевод заглавия: Зависящие от температуры переходы s± ↔ s++ в многозонной модели сверхпроводников на основе железа с примесями

РУБ Multidisciplinary Sciences
Рубрики:
IRON-BASED MATERIALS
Кл.слова (ненормированные):
unconventional superconductors -- iron pnictides -- iron chalcogenides -- impurity scattering
Аннотация: We study the dependence of the superconducting gaps on both the disorder and the temperature within the two-band model for iron-based materials. In the clean limit, the system is in the s± state with sign-changing gaps. Scattering by nonmagnetic impurities leads to the change of the sign of the smaller gap, resulting in a transition from the s± to the s++ state with the sign-preserving gaps. We show here that the transition is temperature-dependent. Thus, there is a line of s±→s++ transition in the temperature–disorder phase diagram. There is a narrow range of impurity scattering rates, where the disorder-induced s±→s++ transition occurs at low temperatures, but then the low-temperature s++ state transforms back to the s± state at higher temperatures. With increasing impurity scattering rate, the temperature of such s++→s± transition shifts to the critical temperature Tc, and only the s++ state is left for higher amounts of disorder.

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Держатели документа:
RAS, SB, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Donostia Int Phys Ctr, Donostia San Sebastian 20018, Spain.
RAS, PN Lebedev Phys Inst, Moscow 119991, Russia.

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Dolgov, O. V.; Шестаков, Вадим Андреевич; Russian Foundation for Basic Research [16-02-00098]; Presidium of RAS Program for the Fundamental Studies [12]; "BASIS" Foundation for Development of Theoretical Physics and Mathematics; Gosbudget program [0356-2017-0030]
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16.

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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17.

    Togushova, Yu. N.
    Role of Interactions in the Energy of the Spin Resonance Peak in Fe-Based Superconductors / Y. N. Togushova, M. M. Korshunov // Solid State Phenomena. - 2019. - Vol. 289 SSP. - P. 212-217, DOI 10.4028/www.scientific.net/SSP.289.212. - Cited References: 30. - This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098), Presidium of RAS Program for the Fundamental Studies #12, and “BASIS” Foundation for Development of Theoretical Physics and Mathematics. MMK acknowledges support by the Gosbudget program # 0356-2017-0030.
   Перевод заглавия: Влияние взаимодействий на энергию спин-резонансного пика в сверхпроводниках на основе железа
Рубрики:
Solid Compounds of Transition Elements III
Кл.слова (ненормированные):
Fe-based superconductors -- Inelastic neutron scattering -- Magnetic mechanism of pairing -- Spin resonance peak -- Unconventional superconductivity
Аннотация: We consider the spin response within the five-orbital model for iron-based superconductors and study two cases: equal and unequal gaps in different bands. In the first case, the spin resonance peak in the superconducting state appears below the characteristic energy scale determined by the gap magnitude, 2ΔL. In the second case, the energy scale corresponds to the sum of smaller and larger gap magnitudes, ΔL+ΔS. Increasing the values of the Hubbard interaction and the Hund's exchange, we observe a shift of the spin resonance energy to lower frequencies.

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Держатели документа:
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Тогушова Ю. Н.; International Conference on Solid Compounds of Transition Elements(21 ; 2018 ; 25- 29 March ; Vienna; Austria)
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18.

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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