Even Parity, Orbital Singlet and Spin Triplet Pairing for Superconducting $La(O_{1-x}F_x)FeAs$

TL;DR

This paper proposes a novel superconducting pairing state for LaO_{1-x}F_xFeAs involving even parity, orbital singlet, and spin triplet, influenced by Fermi surface shape and ferromagnetic fluctuations, predicting unique spectral features.

Contribution

It introduces a new pairing symmetry model for LaO_{1-x}F_xFeAs based on its electronic structure and magnetic interactions, with implications for experimental detection.

Findings

Predicted Fermi arc-like anisotropic superconducting gap

Identified the role of ferromagnetic fluctuations in pairing

Discussed impurity effects on the superconducting state

Abstract

In the present paper, we propose the parity even,orbital singlet and spin triplet pairing state as the ground state of the newly discovered super-conductor $LaO_{1-x}F_xFeAs$.The pairing mechanism involves both the special shape of the electron fermi surface and the strong ferromagnetic fluctuation induced by Hund's rule coupling.The special behavior of the Bogoliubov quasi-particle spectrum may leads to "Fermi arc" like anisotropy super-conducting gap, which can be detected by angle resolved photo emission(ARPES).The impurity effects are also discussed.