Odd parity pairing and nodeless antiphase s± in iron-based superconductors

Ningning Hao and Jiangping Hu
Phys. Rev. B 89, 045144 – Published 31 January 2014

Abstract

We discuss the sign change of superconducting order parameters in both real and reciprocal spaces when the odd parity spin singlet pairing proposed recently by Hu [Phys. Rev. X 3, 031004 (2013)] is allowed. We show that in this case an nodeless antiphase s± can be generated. In a 2-Fe Brilliouin zone (BZ), sign change exists between two hole pockets and between two electron pockets. In a 1-Fe BZ, which includes two 2-Fe BZs, the sign change is between two 2-Fe BZs, which leads to a d-wave type sign distribution on the electron pockets, namely, an antiphase s± state with no symmetry protected gapless node on the electron pockets. This sign change character consistently explains experimental results related to sign change properties measured on both iron-pnictides and iron-chalcogenides.

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  • Received 23 May 2013
  • Revised 16 January 2014

DOI:https://doi.org/10.1103/PhysRevB.89.045144

©2014 American Physical Society

Authors & Affiliations

Ningning Hao and Jiangping Hu

  • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • and Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA

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Issue

Vol. 89, Iss. 4 — 15 January 2014

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