Volume 128, Number 4, November 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||31 January 2020|
Magnetic competition in Fe-based germanide and silicide superconductors
1 European Synchrotron Radiation Facility - 71 Avenue des Martyrs, F-38000 Grenoble, France
2 Laboratoire de Physique et Etude des Matériaux, UMR8213 CNRS/ESPCI/UPMC - Paris, France
3 Dipartimento di Fisica, Università di Cagliari - I-09042 Monserrato, Italy
4 Institut Néel, CNRS & Univ. Grenoble Alpes - F-38042 Grenoble, France
5 CNRS, Univ. Bordeaux, ICMCB, UPR 9048 - F-33600 Pessac, France
Received: 7 October 2019
Accepted: 29 November 2019
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 YFe2Ge2 under pressure —which then can be expected to enhance its superconductivity.
PACS: 74.70.-b – Superconducting materials other than cuprates
© EPLA, 2020
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