Theoretical study of correlation between spin fluctuations and Tc in isovalent-doped 1111 iron-based superconductors

Hayato Arai, Hidetomo Usui, Katsuhiro Suzuki, Yuki Fuseya, and Kazuhiko Kuroki
Phys. Rev. B 91, 134511 – Published 21 April 2015

Abstract

Motivated by recent experiments on isovalent-doped 1111 iron-based superconductors LaFeAs1xPxO1yFy and the theoretical study that followed, we investigate, within the five-orbital model, the correlation between spin fluctuations and the superconducting transition temperature, which exhibits a double-dome feature upon varying the Fe-As-Fe bond angle. Around the first dome with higher Tc, the low-energy spin fluctuation and Tc are not tightly correlated because the finite-energy spin fluctuation also contributes to superconductivity. On the other hand, the strength of the low-energy spin fluctuation originating from the dxz/yz orbital is correlated with Tc in the second dome with lower Tc. These calculation results are consistent with a recent NMR study, and hence strongly suggest that the pairing in iron-based superconductors is predominantly caused by multiorbital spin fluctuations.

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  • Received 28 January 2015
  • Revised 31 March 2015

DOI:https://doi.org/10.1103/PhysRevB.91.134511

©2015 American Physical Society

Authors & Affiliations

Hayato Arai1, Hidetomo Usui2, Katsuhiro Suzuki2, Yuki Fuseya1, and Kazuhiko Kuroki2

  • 1Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
  • 2Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

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Issue

Vol. 91, Iss. 13 — 1 April 2015

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