Magnetic competition in iron-based germanide and silicide superconductors

Abstract

We address the ferromagnetic tendencies detrimental for superconductivity that are related to the substitution of the pnictogen As atom with Ge or Si, together with additional substitutions in the spacer layers in 122 and 1111 Fe-based superconductors. Intermediate compounds in which these substitutions are realized individually are studied within density functional theory. We thus single out the control of spacer ions as an effective way to handle such a ferromagnetism, and we also show that it is suppressed in YFe${}_2$Ge${}_2$ under pressure ---which then can be expected to enhance its superconductivity.

arXiv commentv1: 6 pages, 4 figures, 3 tables. v2: 7 pages, new figures 2 and 4 and extended discussion. v3: 7 pages, 4 figures, 4 tables. v4: published version

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Cited by in corpus (2)

• Infinite-layer fluoro-nickelates as $d^9$ model materials
• Magnetic and structural properties of the iron silicide superconductor LaFeSiH