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    Spin-orbit coupling in Fe-based superconductors / M. M. Korshunov [et al.] // J. Supercond. Nov. Magn. - 2013. - Vol. 26, Is. 9. - P. 2873-2874, DOI 10.1007/s10948-013-2212-6 . - ISSN 1557-1939
   Перевод заглавия: Спин-орбитальное взаимодействие в сверхпроводниках на основе железа
Кл.слова (ненормированные):
Fe-based superconductors -- Spin-orbit coupling -- Spin-resonance peak
Аннотация: We study the spin resonance peak in recently discovered iron-based superconductors. The resonance peak observed in inelastic neutron scattering experiments agrees well with predicted results for the extended s-wave (s В±) gap symmetry. Recent neutron scattering measurements show that there is a disparity between transverse and longitudinal components of the dynamical spin susceptibility. Such breaking of the spin-rotational invariance in the spin-liquid phase can occur due to spin-orbit coupling. We study the role of the spin-orbit interaction in the multiorbital model for Fe-pnictides and show how it affects the spin resonance feature. В© 2013 Springer Science+Business Media New York.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Ruhr Univ Bochum, Inst Theoret Phys 3, D-44801 Bochum, Germany
Kazan Fed Univ, Kazan 420008, Russia
Univ Florida, Dept Phys, Gainesville, FL 32611 USA;

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu. N.; Тогушова Ю. Н.; Eremin, I.; Hirschfeld, P. J.
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Evolution of symmetry and structure of the gap in Fe-based superconductors with doping and interactions / А. Chubukov [et al.] // Bull. Amer. Phys. Soc. - 2012. - Vol. 57, № 1. - P. 316
Аннотация: We present a detailed study of the symmetry and structure of the pairing gap in Fe-based superconductors. We treat them as quasi-2D systems, decompose the pairing interaction into s− wave and d− wave channels and into contributions from scattering between different Fermi surfaces and analyze how each scattering evolves with doping and input parameters. We verify that each interaction is well approximated by the lowest angular harmonics and use this simplification to analyze the interplay between the interaction with and without spin-fluctuation components, the origin of the attraction in the s± and d x 2 −y 2 channels, the competition between them, the nature of angular dependence of the s± gaps along the electron Fermi surface, the conditions under which s± gap develops nodes, and the origin of superconductivity in heavily electron- or hole-doped systems, when only Fermi surfaces of one type are present. In particular, we find that with increased electron and hole doping, the competition from d− wave grows. In the case of strong hole doping, there is some ambiguity over the leading solution, but in the case of strong electron doping, d− wave emerges as clear winner.

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Аннотация
Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Chubukov, A. V.; Maiti, S.; Korshunov, M. A.; Коршунов, Михаил Анатольевич; Maier, T.; Hirschfeld, P.J.; APS March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA); American Physical Society March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA)
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Disorder-induced transition between s± and s++ states Fe-based superconductors / M. M. Korshunov [et al.] // International Conference "APS". March Meeting : bulletin of the American Physical Society. - 2012. - Vol. 57, № 1 . - P. 113
Аннотация: The symmetry and structure of the superconducting gap in recently discovered Fe-based materials is one of the main challenges in this exciting new field (see, e.g. P.J. Hirschfeld, M.M. Korshunov, and I.I. Mazin, Rep. Progr. Phys. 2011). We have reexamined the problem of disorder in 2-band superconductors, and shown within the framework of the T-matrix approximation that the suppression of Tc can be described by a single parameter depending on the intra- and interband impurity scattering rates. Tc is shown to be more robust against nonmagnetic impurities than would be predicted in the trivial extension of Abrikosov-Gor'kov theory. We find disorder-induced transition from the s± state to a gapless and then to a fully gapped s++ state, controlled by the sign of the average coupling constant.

Материалы конференции,
Аннотация

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Efremov, D. V.; Dolgov, O. V.; Golubov, A. A.; Hirschfeld, P. J.; APS March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA); American Physical Society March Meeting (2012 ; 27 Feb.-2 March ; Boston, Massachusetts, USA); International Conference "APS". March Meeting 2012(Boston, Massachusetts, USA)
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Role of the spin-orbit coupling in the spin-resonance formation in Fe-based superconductors / M. M. Korshunov [и др.] // Bull. Amer. Phys. Soc. - 2013. - Vol. 58, № 1. - Ст. N37.3. - P. 443
Аннотация: Determination of the gap symmetry is an important step towards uncovering mechanism of superconductivity in Fe-based materials. One of the key experiments in support of the s ± spin-fluctuation-mediated gap was observation of the spin-resonance peak in many pnictides and chalcogenides, see P.J. Hirschfeld et al., Rep.Prog.Phys. 74, 124508 (2011). Recently, in inelastic polarized neutron scattering measurements by Lipscombe et al., Phys.Rev. B 82, 064515 (2010), it was found that the peaks in the transverse and longitudinal components of the spin susceptibility of BaFe 1.9 Ni 0.1 As 2 exhibit rather different behavior, and argued that the true spin resonance exists in the transverse channel only. Here, on the basis of the 5-orbital model, we argue that this disparity arises from spin-orbit coupling. It also leads to the relative shift of the two component's resonance frequency with lower frequency one exhibiting larger enhancement.

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Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu. N.; Тогушова Ю. Н.; Eremin, I.; Hirschfeld, P. J.; APS March Meeting (2013 ; March ; 18-22 ; Baltimore, Maryland, USA); American Physical Society March Meeting (2013 ; March ; 18-22 ; Baltimore, Maryland, USA)
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Spin-orbit coupling in Fe-based superconductors / M. M. Korshunov [et al.] // V. V. Nemoshkalenko Memor. Conf. and Workshop "Electronic Struct. and Electron Spectrosc." (ES&ES 2013). - 2013. - P. 13

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Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu.N.; Тогушова Ю.Н.; Eremin, I.; Hirschfeld, P. J.; Национальная Академия наук Украины; Институт металлофизики НАН Украины; "Electronic Structure and Electron Spectroscopies", V. V. Nemoshkalenko Memorial Conference and Workshop (20-23 may 2013 ; Kiev, Ukraine)
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Spin-orbit coupling in Fe-based superconductors / M. M. Korshunov [et al.] // Quant. in Complex Matter: Supercond., Magnet. and Ferroelectr. - Rome, 2013. - P. 134 . - ISBN 978-88-6683-016-0

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Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Togushova, Yu. N.; Тогушова Ю. Н.; Eremin, I.; Hirschfeld, P. J.; Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity, International Conference (May 27 - June 1 2013 ; Ischia, Italy)
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Evolution of symmetry and structure of the gap in iron-based superconductors with doping and interactions / S. . Maiti [et al.] // Phys. Rev. B. - 2011. - Vol. 84, Is. 22. - Ст. 224505, DOI 10.1103/PhysRevB.84.224505. - Cited References: 46. - We acknowledge helpful discussions with L. Benfatto, R. Fernandes, W. Hanke, I. Eremin, H. Kontani, K. Kuroki, Y. Matsuda, I. Mazin, R. Prozorov, D. Scalapino, J. Schmalian, Z. Tesanovic, R. Thomale, M. Vavilov, and A. Vorontsov. This work was supported by NSF-DMR-0906953 (S. M. and A. V. C.). Partial support from MPI PKS (Dresden) (S. M. and A. V. C.) and the Humboldt Foundation (A. V. C.) is gratefully acknowledged. T. A. M. acknowledges support from the Center of Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Office of Basic Energy Sciences, US Department of Energy. M. M. K. and P. J. H. acknowledge support from DOE DE-FG02-05ER46236. M. M. K. is grateful for support from RFBR (Grant No. 09-02-00127), Presidium of RAS program N5.7, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK P891 and GK 16.740.12.0731), and the President of Russia (Grant No. MK-1683.2010.2). . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON
Аннотация: We present a detailed study of the symmetry and structure of the pairing gap in Fe-based superconductors (FeSCs). We treat FeSCs as quasi-2D, decompose the pairing interaction in the XY plane in s-wave and d-wave channels into contributions from scattering between different Fermi surfaces, and analyze how each scattering evolves with doping and input parameters. We verify that each interaction is well approximated by the lowest angular harmonics. We use this simplification to analyze the interplay between the interaction with and without spin-fluctuation components, the origin of the attraction in the s(+/-) and d(x2-y2) channels, the competition between them, the angular dependence of the s(+/-) gaps along the electron Fermi surface, the conditions under which the s(+/-) gap develops nodes, and the origin of superconductivity in heavily electron-or hole-doped systems, when only Fermi surfaces of one type are present. We also discuss the relation between RPA and RG approaches for FeSCs.

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Держатели документа:
[Maiti, S.
Chubukov, A. V.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[Korshunov, M. M.
Hirschfeld, P. J.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Korshunov, M. M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Maier, T. A.] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA
[Maier, T. A.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
ИФ СО РАН
Department of Physics, University of Wisconsin, Madison, WI 53706, United States
Department of Physics, University of Florida, Gainesville, FL 32611, United States
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russian Federation
Computer Science and Mathematics Division, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States

Доп.точки доступа:
Maiti, S.; Korshunov, M. M.; Коршунов, Максим Михайлович; Maier, T. A.; Hirschfeld, P. J.; Chubukov, A. V.
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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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Disorder-induced transition between s(+/-) and s(++) states in two-band superconductors / D. V. Efremov [et al.] // Phys. Rev. B. - 2011. - Vol. 84, Is. 18. - Ст. 180512, DOI 10.1103/PhysRevB.84.180512. - Cited References: 31. - The authors are grateful to S.-L. Drechsler, P. Fulde, I. I. Mazin, V. Mishra, and D. J. Scalapino for useful discussions. The present work was partially supported by the DFG Priority Programme SPP1458 (D.V.E.), Dutch FOM(A.A.G.), DOEDE-FG02-05ER46236 (P.J.H. and M.M.K.), and RFBR 09-02-00127, Presidium of RAS program N5.7, FCP GK P891, and GK 16.740.12.0731, and President of Russia MK-1683.2010.2 (M.M.K.). P.J.H. and M.M.K. are grateful for the support of the Kavli Institute for Theoretical Physics and the Stanford Institute for Materials & Energy Science during the writing of this work. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTIVITY
IMPURITIES
DENSITY
Аннотация: We have reexamined the problem of disorder in two-band superconductors, and shown, within the framework of the T-matrix approximation, that the suppression of T-c can be described by a single parameter depending on the intraband and interband impurity scattering rates. T-c is shown to be more robust against nonmagnetic impurities than would be predicted in the trivial extension of Abrikosov-Gor'kov theory. We find a disorder-induced transition from the s(+/-) state to a gapless and then to a fully gapped s(++) state, controlled by a single parameter-the sign of the average coupling constant (lambda). We argue that this transition has strong implications for experiments.

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Держатели документа:
[Efremov, D. V.
Dolgov, O. V.] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
[Korshunov, M. M.
Hirschfeld, P. J.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Korshunov, M. M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Golubov, A. A.] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
[Golubov, A. A.] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
ИФ СО РАН
Max-Planck-Institut fur Festkorperforschung, D-70569 Stuttgart, Germany
Department of Physics, University of Florida, Gainesville, FL 32611, United States
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny Prospect 79, 660041 Krasnoyarsk, Russian Federation
Faculty of Science and Technology, MESA+ Institute of Nanotechnology, University of Twente, NL-7500 AE Enschede, Netherlands

Доп.точки доступа:
Efremov, D. V.; Korshunov, M. M.; Коршунов, Максим Михайлович; Dolgov, O. V.; Golubov, A. A.; Hirschfeld, P. J.
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10.

Evolution of the Superconducting State of Fe-Based Compounds with Doping / S. . Maiti [et al.] // Phys. Rev. Lett. - 2011. - Vol. 107, Is. 14. - Ст. 147002, DOI 10.1103/PhysRevLett.107.147002. - Cited References: 29. - We acknowledge helpful discussions with L. Benfatto, A. Bernevig, R. Fernandes, W. Hanke, I. Eremin, Y. Matsuda, I. Mazin, R. Prozorov, D. Scalapino, Z. Tesanovic, R. Thomale, M. Vavilov, and A. Vorontsov. This work was supported by NSF-DMR-0906953 (S. M. and A. V. C.), DOE DE-FG02-05ER46236 (P. J. H.), the Center for Nanophase Materials Sciences, sponsored at ORNL by the Office of Basic Energy Sciences, DOE (T. A. M.), and RFBR 09-02-00127, Presidium of RAS program N5.7, FCP GK P891, and President of Russia MK-1683.2010.2 (M. M. K.). We are grateful to KITP at Santa Barbara for its hospitality during the work on this manuscript. . - ISSN 0031-9007

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
Doping evolution -- Fe-based superconductors -- Heavily doped -- Input parameter -- Low energies -- Superconducting gaps -- Superconducting state -- Penetration depth (superconductivity) -- Superconducting materials -- Superconductivity
Аннотация: We introduce an effective low-energy pairing model for Fe-based superconductors with s- and d-wave interaction components and a small number of input parameters and use it to study the doping evolution of the symmetry and the structure of the superconducting gap. We argue that the model describes the entire variety of pairing states found so far in the Fe-based superconductors and allows one to understand the mechanism of the attraction in s(+/-) and d(x2-y2) channels, the competition between s- and d-wave solutions, and the origin of superconductivity in heavily doped systems, when only electron or only hole pockets are present.

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Держатели документа:
[Maiti, S.
Chubukov, A. V.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[Korshunov, M. M.
Hirschfeld, P. J.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Korshunov, M. M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Maier, T. A.] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA
[Maier, T. A.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
ИФ СО РАН
Department of Physics, University of Wisconsin, Madison, WI 53706, United States
Department of Physics, University of Florida, Gainesville, FL 32611, United States
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Computer Science and Mathematics Division, Center for Nanophase Materials Sciences, Oak Ridge National Lab, Oak Ridge, TN 37831, United States

Доп.точки доступа:
Maiti, S.; Korshunov, M. M.; Коршунов, Максим Михайлович; Maier, T. A.; Hirschfeld, P. J.; Chubukov, A. V.
}
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