Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe${}_2$

Abstract

We investigate the superconducting gap function of topological superconductor PbTaSe${}_2$. Temperature, magnetic field, and three-dimensional (3D) field-angle dependences of the specific heat prove that the superconductivity of PbTaSe${}_2$ is fully-gapped, with two isotropic $s$-wave gaps. The pair-breaking effect is probed by systematically increasing non-magnetic disorders through H${}^{+}$-irradiations. The superconducting transition temperature, $T_{\mathrm{c}}$, is found to be robust against disorders, which suggests that the pairing should be sign-preserved rather than sign-reversed.

9 pages, 7 figures

References in corpus (10)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Phases of Noncentrosymmetric Superconductors: Edge States, Majorana Fermions, and the Non-Abelian Statistics
• Orientational field-dependence of low-lying excitations in mixed state of unconventional superconductors
• Quasi-particle evidence for the nematic state above $T_{\mathrm{c}}$ in Sr${}_x$Bi${}_2$Se${}_3$
• Gap structure of FeSe determined by field-angle-resolved specific heat measurements
• Vortex State and Field-Angle Resolved Specific Heat Oscillation for H // ab in d-Wave Superconductors
• Quantum oscillations in the non-centrosymmetric superconductor and topological nodal-line semimetal PbTaSe${}_2$
• Symmetry-unprotected nodes or gap minima in $s_{++}$ state of FeSe single crystal
• Topological Phase Transition Under Pressure in the Topological Nodal Line Superconductor PbTaSe${}_2$

Cited by in corpus (4)

• ${}^{181}$Ta Nuclear quadrupole resonance study of non-centrosymmetric superconductor PbTaSe${}_2$
• Effects of disorder on the quantum transport properties in topologically nontrivial metal PbTaSe${}_2$
• Impact of Disorder on the Superconducting Properties and BCS-BEC Crossover in FeSe Single Crystals
• Enhancement of the superconducting transition temperature due to multiband effect in the topological nodal-line semimetal Pb${}_{1-x}$Sn${}_x$TaSe${}_2$