High-Tc superconductivity near the anion height instability in Fe-based superconductors: Analysis of LaFeAsO1-x Hx

Seiichiro Onari, Youichi Yamakawa, Hiroshi Kontani

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46 Citations (Scopus)

Abstract

The isostructural transition in the tetragonal phase with a sizable change in the anion height, is realized in heavily H-doped LaFeAsO and (La,P) codoped CaFe2As2. In these compounds, the superconductivity with higher Tc (40-50 K) is realized near the isostructural transition. To find the origin of the anion-height instability and the role in realizing the higher-Tc state, we develop the orbital-spin fluctuation theory by including the vertex correction. We analyze LaFeAsO1-xHx and find that the non-nematic orbital fluctuations, which induce the anion-height instability, are automatically obtained at x∼0.5, in addition to the conventional nematic orbital fluctuations at x∼0. The non-nematic orbital order triggers the isostructural transition, and its fluctuation would be a key ingredient to realize higher-Tc superconductivity of order 50 K.

Original languageEnglish
Article number187001
JournalPhysical Review Letters
Volume112
Issue number18
DOIs
Publication statusPublished - May 6 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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