Probing the superconducting gap structure in the noncentrosymmetric topological superconductor ZrRuAs
Debarchan Das, D. T. Adroja, M. R. Lees, R. W. Taylor, Z. S. Bishnoi, V. K. Anand, A. Bhattacharyya, Zurab Guguchia, C. Baines, H. Luetkens, Gavin B. G. Stenning, Lei Duan, Xiancheng Wang, Changqing Jin
Abstract
The ternary transition metal pnictide ZrRuAs has been suggested to be a rare example of a superconducting topological crystalline insulator, with evidence for topological states along with bulk superconductivity below ${T}_{c}$ = 7.9 K. Here, the authors have probed the superconducting gap structure of this compound using muon-spin rotation and relaxation spectroscopy. Their results reveal a nodeless isotropic $s$-wave gap structure and confirm that time-reversal symmetry is preserved in the superconducting state of noncentrosymmetric ZrRuAs.