Mechanism for Explaining Differences in the Order Parameters of FeAs-Based and FeP-Based Pnictide Superconductors

Ronny Thomale, Christian Platt, Werner Hanke, and B. Andrei Bernevig
Phys. Rev. Lett. 106, 187003 – Published 6 May 2011
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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.

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  • Received 24 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.187003

© 2011 American Physical Society

Authors & Affiliations

Ronny Thomale1, Christian Platt2, Werner Hanke2, and B. Andrei Bernevig1

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
  • 2Institute for Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, D 97074 Würzburg, Germany

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Vol. 106, Iss. 18 — 6 May 2011

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Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

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