Ab initio studies of magnetism in the iron chalcogenides FeTe and FeSe

Motoaki Hirayama, Takahiro Misawa, Takashi Miyake, Masatoshi Imada

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15 Citations (Scopus)

Abstract

The iron chalcogenides FeTe and FeSe belong to the family of iron-based superconductors. We study the magnetism in these compounds in the normal state using the ab initio downfolding scheme developed for strongly correlated electron systems. In deriving ab initio low-energy effective models, we employ the constrained GW method to eliminate the double counting of electron correlations originating from the exchange correlations already taken into account in the density functional theory. By solving the derived ab initio effective models, we reveal that the elimination of the double counting is important in reproducing the bicollinear antiferromagnetic order in FeTe, as is observed in experiments. We also show that the elimination of the double counting induces a unique degeneracy of several magnetic orders in FeSe, which may explain the absence of the magnetic ordering. We discuss the relationship between the degeneracy and the recently found puzzling phenomena in FeSe as well as the magnetic ordering found under pressure.

Original languageEnglish
Article number093703
Journaljournal of the physical society of japan
Volume84
Issue number9
DOIs
Publication statusPublished - 2015 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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