Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe2
Yue Sun, Shunichiro Kittaka, Toshiro Sakakibara, Kazushige Machida, R. Sankar, Xiaofeng Xu, Nan Zhou, Xiangzhuo Xing, Zhixiang Shi, Sunseng Pyon, Tsuyoshi Tamegai
DOI 10.1103/PhysRevB.102.024517 · Physical Review B
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Abstract
We investigate the superconducting gap function of the topological superconductor PbTaSe2. The temperature, magnetic field, and three-dimensional (3D) field-angle dependences of the specific heat prove that the superconductivity of PbTaSe2 is fully gapped, with two isotropic s-wave gaps. The pair-breaking effect is probed by systematically increasing nonmagnetic disorders through H+ irradiation. The superconducting transition temperature Tc is found to be robust against disorders, which suggests that the pairing should be sign preserved rather than sign reversed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | onset |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | zero_resistance |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | midpoint |
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