Mechanism for explaining differences in the order parameters of FeAs-based and FeP-based pnictide superconductors

Ronny Thomale, Christian Platt, Werner Hanke, B. Andrei Bernevig

Research output: Contribution to journalArticle

116 Scopus citations

Abstract

We put forward a scenario that explains the difference between the order-parameter character in arsenide (As) and phosphorous (P) iron-based superconductors. Using functional renormalization group to analyze it in detail, we find that nodal superconductivity on the electron pockets (hole pocket gaps are always nodeless) can naturally appear when the hole pocket at (π,π) in the unfolded Brillouin zone is absent, as is the case in LaOFeP. There, electron-electron interactions render the gap on the electron pockets softly nodal (of s± form). When the pocket of dxy orbital character is present, intraorbital interactions with the dxy part of the electron Fermi surface drives the superconductivity nodeless.

Original languageEnglish (US)
Article number187003
JournalPhysical review letters
Volume106
Issue number18
DOIs
StatePublished - May 6 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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