Nontrivial Role of Interlayer Cation States in Iron-Based Superconductors

Daniel Guterding, Harald O. Jeschke, I. I. Mazin, J. K. Glasbrenner, E. Bascones, Roser Valentí

研究成果査読

13 被引用数 (Scopus)

抄録

Unconventional superconductivity in iron pnictides and chalcogenides has been suggested to be controlled by the interplay of low-energy antiferromagnetic spin fluctuations and the particular topology of the Fermi surface in these materials. Based on this premise, one would also expect the large class of isostructural and isoelectronic iron germanide compounds to be good superconductors. As a matter of fact, they, however, superconduct at very low temperatures or not at all. In this work we establish that superconductivity in iron germanides is suppressed by strong ferromagnetic tendencies, which surprisingly do not originate from changes in bond angles or bond distances with respect to iron pnictides and chalcogenides, but are due to changes in the electronic structure in a wide range of energies happening upon substitution of atom species (As by Ge and the corresponding spacer cations). Our results indicate that superconductivity in iron-based materials may not always be fully understood based on d or d-p model Hamiltonians only.

本文言語English
論文番号017204
ジャーナルPhysical Review Letters
118
1
DOI
出版ステータスPublished - 1月 5 2017
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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