Magnetic and superconducting phase diagram of the half-Heusler topological semimetal HoPdBi
Résumé
We report a study of the magnetic and electronic properties of the non-centrosymmetric half-Heusler antiferromagnet HoPdBi (T N = 2.0 K). Magnetotransport measurements show HoPdBi has a semimetallic behaviour with a carrier concentration n = 3.7×10 18 cm −3 extracted from the Shubnikov-de Haas effect. The magnetic phase diagram in the field-temperature plane has been determined by transport, magnetization and thermal expansion measurements: magnetic order is suppressed at B M ∼ 3.6 T for T → 0. Superconductivity with T c ∼ 1.9 K is found in the antiferromagnetic phase. Ac-susceptibility measurements provide solid evidence for bulk superconductivity below T c = 0.75 K with a screening signal close to a volume fraction of 100 %. The upper critical field shows an unusual linear temperature variation with B c2 (T → 0) = 1.1 T. We also report electronic structure calculations that classify HoPdBi as a new topological semimetal, with a non-trivial band inversion of 0.25 eV.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)
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