Abstract
We investigate the superconducting gap function of the topological superconductor . The temperature, magnetic field, and three-dimensional (3D) field-angle dependences of the specific heat prove that the superconductivity of is fully gapped, with two isotropic -wave gaps. The pair-breaking effect is probed by systematically increasing nonmagnetic disorders through irradiation. The superconducting transition temperature is found to be robust against disorders, which suggests that the pairing should be sign preserved rather than sign reversed.
- Received 9 April 2020
- Revised 7 July 2020
- Accepted 7 July 2020
DOI:https://doi.org/10.1103/PhysRevB.102.024517
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