Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1103/PhysRevB.84.224505

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.

Журнал: PHYSICAL REVIEW B

Выпуск журнала: Vol. 84, Is. 22

ISSN журнала: 10980121

Место издания: COLLEGE PK

Издатель: AMER PHYSICAL SOC

• Maiti S. (Department of Physics,University of Wisconsin)
• Chubukov A.V. (Department of Physics,University of Wisconsin)
• Korshunov M.M. (Siberian Federal University)
• Hirschfeld P.J. (Department of Physics,University of Florida)
• Maier T.A. (Computer Science and Mathematics Division,Center for Nanophase Materials Sciences,Oak Ridge National Laboratory)

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