1. Probing the superconducting gap structure in the noncentrosymmetric topological superconductor ZrRuAs
- Author
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Das, Debarchan, Adroja, D. T., Lees, M. R., Taylor, R. W., Bishnoi, Z. S., Anand, V. K., Bhattacharyya, A., Guguchia, Z., Baines, C., Luetkens, H., Stenning, G. B. G., Duan, Lei, Wang, Xiancheng, and Jin, Changqing
- Subjects
Condensed Matter - Superconductivity ,Condensed Matter - Strongly Correlated Electrons - Abstract
The superconducting gap structure of a topological crystalline insulator (TCI) candidate ZrRuAs ($T^{\rm on}_{\rm c}$ = 7.9(1) K) with a noncentrosymmetric crystal structure has been investigated using muon spin rotation/relaxation ($\mu$SR) measurements in transverse-field (TF) and zero-field (ZF) geometries. We also present the results of magnetization, electrical resistivity and heat capacity measurements on ZrRuAs, which reveal bulk superconductivity below 7.9~K. The temperature dependence of the effective penetration depth obtained from the analysis of the TF-$\mu$SR spectra below $T_{\rm c}$ is well described by an isotropic $s$-wave gap model as also inferred from an analysis of the heat capacity in the superconducting state. ZF $\mu$SR data do not show any significant change in the muon spin relaxation rate above and below the superconducting transition temperature indicating that time-reversal symmetry is preserved in the superconducting state of this material., Comment: 10 pages, 6 figures
- Published
- 2021
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