Pairing symmetry in a two-orbital exchange coupling model of oxypnictides

Kangjun Seo, B. Andrei Bernevig, Jiangping Hu

Research output: Contribution to journalArticle

294 Scopus citations

Abstract

We study the pairing symmetry of a two-orbital J1-J2 model for FeAs layers in oxypnictides. We show that the mixture of an intraorbital unconventional sx2y2∼cos(kx)cos(ky) pairing symmetry, which changes sign between the electron and hole Fermi surfaces, and a very small dx2-y2∼cos(kx)-cos(ky) component is favored in a large part of the J1-J2 phase diagram. A pure sx2y2 pairing state is favored for J2>J1. The signs of the dx2-y2 order parameters in the two different orbitals are opposite. While a small dxy∼sin(kx)sin(ky) interorbital pairing coexists in the above phases, the intraorbital dxy pairing is not favored even for large J2.

Original languageEnglish (US)
Article number206404
JournalPhysical review letters
Volume101
Issue number20
DOIs
StatePublished - Nov 14 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Pairing symmetry in a two-orbital exchange coupling model of oxypnictides'. Together they form a unique fingerprint.

  • Cite this