Probing the superconducting gap structure in the noncentrosymmetric topological superconductor ZrRuAs

Abstract

The superconducting gap structure of a topological crystalline insulator (TCI) candidate ZrRuAs ($T_{\mathrm{c}}^{\mathrm{on}}$ = 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 $T_{\mathrm{c}}$ 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.

10 pages, 6 figures

References in corpus (6)

• Magnetic Penetration Depth in Unconventional Superconductors
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Anomalous Andreev bound state in non-centrosymmetric superconductors
• Evidence of nodes in the order parameter of the superconducting doped topological insulator Nb${}_x$Bi${}_2$Se${}_3$ via penetration depth measurements
• Properties of Binary Transition-Metal Arsenides (TAs)
• Probing the superconducting ground state of ZrIrSi: A $\mu$SR study

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• Superconducting ground state of nonsymmorphic superconducting compound Zr${}_2$Ir
• Pressure-Tuning Superconductivity in Noncentrosymmetric Topological Materials ZrRuAs
• Probing the superconducting gap structure of ScRuSi via $\mu$SR and first-principles calculations
• Type-II superconductivity in the Dirac semimetal PdTe2
• Multiband superconductivity in the topological Kramers nodal-line semimetals
• Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr${}_2$B${}_2$
• NbReSi: A Noncentrosymetric Superconductor with Large Upper Critical Field