Pressure-Tuning Superconductivity in Noncentrosymmetric Topological Materials ZrRuAs

Abstract

Recently, the hexagonal phase of ternary transition metal pnictides TT'X (T = Zr, Hf; T'= Ru; X = P, As), which are well-known noncentrosymmetric superconductors, were predicted to host nontrivial bulk topology. In this work, we systematically investigate the electronic responses of ZrRuAs to external pressure. At ambient pressure, ZrRuAs show superconductivity with Tc ~ 7.74 K, while a large upper critical field ~ 13.03 T is obtained for ZrRuAs, which is comparable to the weak-coupling Pauli limit. The resistivity of ZrRuAs exhibits a non-monotonic evolution with increasing pressure. The superconducting transition temperature Tc increases with applied pressure and reaches a maximum value of 7.93 K at 2.1 GPa, followed by a decrease. The nontrivial topology is robust and persists up to the high-pressure regime. Considering both robust superconductivity and intriguing topology in this material, our results could contribute to studies of the interplay between topological electronic states and superconductivity.

17 pages,6 figures, 1 table

References in corpus (8)

• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• Z2Pack: Numerical Implementation of Hybrid Wannier Centers for Identifying Topological Materials
• Weyl semimetals from noncentrosymmetric topological insulators
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Charge density wave orders and enhanced superconductivity under pressure in the kagome metal CsV3Sb5
• Topological Order and Non-Abelian Statistics in Noncentrosymmetric s-Wave Superconductors
• Caging-Pnictogen-Induced Superconductivity in Skutterudites IrX3 (X = As, P)
• Probing the superconducting gap structure in the noncentrosymmetric topological superconductor ZrRuAs