Phase diagram and superconducting states in LaFeAsO1-xH x based on the multiorbital extended Hubbard model

Y. Yamakawa, S. Onari, H. Kontani, N. Fujiwara, S. Iimura, H. Hosono

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19 Citations (Scopus)

Abstract

To understand the recently established unique magnetic and superconducting phase diagram of LaFeAsO1-xHx, we analyze the realistic multiorbital tight-binding model for x=0-0.4 beyond the rigid-band approximation. Both the spin and orbital susceptibilities are calculated in the presence of the Coulomb and charge quadrupole interactions. It is found that both orbital and spin fluctuations strongly develop at both x∼0 and 0.4, due to the strong violation of the rigid-band picture in LaFeAsO 1-xHx. Based on this result, we discuss the experimental phase diagram, especially the double-dome superconducting phase. Moreover, we show that the quadrupole interaction is effectively produced by the vertex correction due to Coulomb interaction, resulting in the mutual development of spin and orbital fluctuations.

Original languageEnglish
Article number041106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number4
DOIs
Publication statusPublished - Jul 22 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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