Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

Rastko Sknepnek; German Samolyuk; Yong-bin Lee; Joerg Schmalian

doi:10.1103/PhysRevB.79.054511

Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

Rastko Sknepnek
, German Samolyuk
, Yong-bin Lee
, Joerg Schmalian

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling J_H. We find that for sufficiently large J_H, nearly commensurate magnetic fluctuations yield a fully gapped s^±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s^±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.

Original language	English
Article number	ARTN 054511
Number of pages	9
Journal	Physical Review B: Condensed matter and materials physics
Volume	79
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.79.054511
Publication status	Published - Feb 2009

Keywords

Systems
Type II superconductors
Magnetic anisotropy
Fluctuations in superconductors
Order
Iron compounds
Fermi surface

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10.1103/PhysRevB.79.054511

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title = "Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations",

abstract = "We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.",

keywords = "Systems, Type II superconductors, Magnetic anisotropy, Fluctuations in superconductors, Order, Iron compounds, Fermi surface",

author = "Rastko Sknepnek and German Samolyuk and Yong-bin Lee and Joerg Schmalian",

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T1 - Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

AU - Sknepnek, Rastko

AU - Samolyuk, German

AU - Lee, Yong-bin

AU - Schmalian, Joerg

PY - 2009/2

Y1 - 2009/2

N2 - We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.

AB - We determine the anisotropy of the spin-fluctuation-induced pairing gap on the Fermi surface of the FeAs-based superconductors as function of the exchange and Hund's coupling JH. We find that for sufficiently large JH, nearly commensurate magnetic fluctuations yield a fully gapped s±-pairing state with small anisotropy of the gap amplitude on each Fermi-surface sheet, but significant variations of the gap amplitude for different sheets of the Fermi surface. In particular, we obtain the large variation of the gap amplitude on different Fermi-surface sheets, as seen in angular resolved photoemission spectroscopy experiments. For smaller values of Hund's coupling incommensurate magnetic fluctuations yield an s±-pairing state with line nodes. Such a state is also possible once the anisotropy of the material is reduced and three-dimensional effects come into play.

KW - Systems

KW - Type II superconductors

KW - Magnetic anisotropy

KW - Fluctuations in superconductors

KW - Order

KW - Iron compounds

KW - Fermi surface

U2 - 10.1103/PhysRevB.79.054511

DO - 10.1103/PhysRevB.79.054511

M3 - Article

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VL - 79

JO - Physical Review B: Condensed matter and materials physics

JF - Physical Review B: Condensed matter and materials physics

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M1 - ARTN 054511

ER -

Anisotropy of the pairing gap of FeAs-based superconductors induced by spin fluctuations

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Keywords

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