Superconductivity in half-Heusler compound TbPdBi

Abstract

We have studied the half-Heusler compound TbPdBi through resistivity, magnetization, Hall effect and heat capacity measurements. A semimetal behavior is observed in its normal state transport properties, which is characterized by a large negative magnetoresistance below 100 K. Notably, we find the coexistence of superconductivity and antiferromagnetism in this compound. The superconducting transition appears at 1.7 K, while the antiferromagnetic phase transition takes place at 5.5 K. The upper critical field $H_{c2}$ shows an unusual linear temperature dependence, implying unconventional superconductivity. Moreover, when the superconductivity is suppressed by magnetic field, its resistivity shows plateau behavior, a signature often seen in topological insulators/semimetals. These findings establish TbPdBi as a platform for study of the interplay between superconductivity, magnetism and non-trivial band topology.

5 pages, 4 figures

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• Interacting spin-3/2 fermions in a Luttinger semimetal: Competing phases and their selection in the global phase diagram
• Magnetotransport signatures of chiral magnetic anomaly in the half-Heusler phase ScPtBi
• First-principles investigations of orthorhombic-cubic phase transition and its effect on thermoelectric properties in cobalt-based ternary alloys
• Multipolar superconductivity in Luttinger semimetals
• Intrinsic finite-energy Cooper pairing in $j=3/2$ superconductors
• Charting the landscape of Bardeen-Cooper-Schrieffer superconductors in experimentally known compounds
• Magnetic phenomena in equiatomic ternary rare earth compounds
• Long-lived non-equilibrium superconductivity in a non-centrosymmetric Rashba semiconductor