Nontrivial Role of Interlayer Cation States in Iron-Based Superconductors

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

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Abstract

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.

Original languageEnglish
Article number017204
JournalPhysical Review Letters
Volume118
Issue number1
DOIs
Publication statusPublished - Jan 5 2017
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Guterding, D., Jeschke, H. O., Mazin, I. I., Glasbrenner, J. K., Bascones, E., & Valentí, R. (2017). Nontrivial Role of Interlayer Cation States in Iron-Based Superconductors. Physical Review Letters, 118(1), [017204]. https://doi.org/10.1103/PhysRevLett.118.017204