Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Poster Session: Superconductivity
TT 98.1: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
A search for superconducting Heusler compounds without inversion symmetry in the AuPdTM set (T = Sc, Y and M = Al, Ga, In) — •Linus Kautzsch, Gerhard H. Fecher, Walter Schnelle, and Claudia Felser — Max Planck Institut CPFS, Dresden, Germany
Superconductivity is well-known in ternary centrosymmetric Heusler compounds like Pd2YSn. One typical fingerprint in the band structure is a saddle point type van Hove singularity near by the Fermi energy єF, which leads to an enhanced density of states.
Furthermore, quaternary Heusler compounds with 1:1:1:1 stoichiometry show the Y-structure (LiMgPdSn, F43m (216)) without inversion symmetry. The pairing state in superconductors with a lack of inversion symmetry should be a mixture of singlet and triplet Cooper pairs. Therefore, these compounds are of importance with respect to understanding superconducting pairing mechanisms. This work is dedicated to extend superconductivity to quaternary Heusler compounds and the experimental investigation of their properties. We identify new quaternary Heusler superconductors through prediction of the van Hove singularity in the band structure. Subsequently, samples of the AuPdTM set (T = Sc, Y and M = Al, Ga, In) were prepared by arc melting and their transport properties were characterized. As an example, AuPdScAl exhibits a transition into the superconducting state in the low temperature region (Tc = 3.0 K). Moreover, these findings enhance the understanding of superconductivity in the Heusler compounds.