d-wave pairing from spin fluctuations in the KxFe2-ySe2 superconductors

被引：173

作者：

Maier, T. A. ^{[1
,2
]}

Graser, S. ^{[3
]}

Hirschfeld, P. J. ^{[4
]}

Scalapino, D. J. ^{[5
]}

机构：

[1] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci & Comp Sci, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Div Math, Oak Ridge, TN 37831 USA

[3] Univ Augsburg, Ctr Elect Correlat & Magnetism, Inst Phys, D-86135 Augsburg, Germany

[4] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[5] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 10期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.83.100515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Angle-resolved photoemission spectroscopy measurements on the recently discovered superconductors in the KFe2Se2 family with critical temperatures up to similar to 33 K suggest that no Fermi pockets of hole character centered on the Gamma point of the Brillouin zone are present, in contrast to all other known ferropnictide and ferrochalcogenide superconductors. Using a fluctuation exchange approximation and a five-orbital tight-binding description of the band structure, we calculate the effective pairing interaction. We find that the pairing state in this system is most likely to have d-wave symmetry due to pair scattering between the remaining electron Fermi pockets at wave vector q similar to (pi, pi), but without any symmetry-imposed nodes for the given Fermi surface. We propose experimental tests of this result, including the form of the resonance spectrum probed by inelastic neutron scattering.

引用

页数：4