Even Parity, Orbital Singlet, and Spin Triplet Pairing for Superconducting LaFeAsO1−xFx

Xi Dai; Zhong Fang; Yi Zhou; Fu-Chun Zhang

doi:10.1103/PhysRevLett.101.057008

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Even Parity, Orbital Singlet, and Spin Triplet Pairing for Superconducting LaFeAsO1−xFx

Xi Dai, Zhong Fang, Yi Zhou, Fu-Chun Zhang

DOI 10.1103/PhysRevLett.101.057008 · Physical Review Letters

T1

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Abstract

We examine the spin-triplet superconducting state of even parity mediated by ferromagnetic Hund’s coupling between electrons in two almost degenerate orbital bands. This state may be realized in the recently discovered LaFeAsO1−xFx. It is robust against orbital-independent disorder. The splitting of the orbital degeneracy suppresses superconductivity and leads to an anisotropic spectrum in the Bogoliubov quasiparticle. The former predicts a strong pressure dependence of Tc and the latter predicts Fermi pockets, which may be tested in angle resolved photoemission spectra.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
CeFxFeAsO1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41	Pressure not reported	unknown
SmFxFeAsO1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown