Even parity, orbital singlet, and spin triplet pairing for superconducting LaFeAsO1-xFx |
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Authors: | Dai Xi Fang Zhong Zhou Yi Zhang Fu-Chun |
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Institution: | Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing, China. daix@aphy.iphy.ac.cn |
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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 LaFeAsO(1-x)F(x). 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 T(c) and the latter predicts Fermi pockets, which may be tested in angle resolved photoemission spectra. |
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