Superconductivity in multi-orbital t-J1-J2 model and its implications for iron pnictides

Pallab Goswami, Predrag Nikolic, Qimiao Si*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Motivated by the bad metal behavior of the iron pnictides, we study a multi-orbital t-J1-J2 model and investigate possible singlet superconducting pairings. Magnetic frustration by itself leads to a large degeneracy in the pairing states. The kinetic energy breaks this into a quasidegeneracy among a reduced set of pairing states. For small electron and hole Fermi pockets, an A1g state dominates over the phase diagram but a B1g state has close-by energy. In addition to the nodeless A 1g sx2y2 channel, the nodal A1g sx2+y2 and B1g dx2-y2 channels are also competitive in the magnetically frustrated J1 ∼ J2 parameter regime. An A1g +iB1g state, which breaks timereversal symmetry, occurs at low temperatures in part of the phase diagram. Implications for the experiments in the iron pnictides are discussed.

Original languageEnglish (US)
Article number37006
JournalEPL
Volume91
Issue number3
DOIs
StatePublished - Aug 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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