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Open AccessArticle

Are AuPdTM (T = Sc, Y and M = Al, Ga, In), Heusler Compounds Superconductors without Inversion Symmetry?

1
Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
2
Johannes Gutenberg—Universität, Institut für Analytische Chemie und Anorganische Chemie, 55122 Mainz, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(16), 2580; https://doi.org/10.3390/ma12162580
Received: 22 July 2019 / Revised: 6 August 2019 / Accepted: 7 August 2019 / Published: 13 August 2019
(This article belongs to the Special Issue Heusler and Half-Heusler Compounds)
Heusler compounds with 2:1:1 stoichiometry either have a centrosymmetric Cu 2 MnAl structure or an Li 2 AgSb structure without a centre of inversion. The centrosymmetry is always lost in quaternary Heusler compounds with 1:1:1:1 stoichiometry and LiMgPdSn structure. This presents the possibility of realizing non-centrosymmetric superconductors in the family of Heusler compounds. The objective of this study is to search for and investigate such quaternary derivatives of Heusler compounds, particularly with respect to superconductivity. Several compounds were identified by carrying out calculations from first principles and superconductivity was observed in experiments conducted on AuPdScAl and AuPtScIn at the critical temperatures of 3.0 and 0.96 K, respectively. All investigated compounds had a valence electron count of 27, which is also the case in centrosymmetric Heusler superconductors. View Full-Text
Keywords: Heusler compounds; superconductivity; electronic structure; non-centrosymmetric Heusler compounds; superconductivity; electronic structure; non-centrosymmetric
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Kautzsch, L.; Mende, F.; Fecher, G.H.; Winterlik, J.; Felser, C. Are AuPdTM (T = Sc, Y and M = Al, Ga, In), Heusler Compounds Superconductors without Inversion Symmetry? Materials 2019, 12, 2580.

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