Full superconducting gap in the doped topological crystalline insulator Sn0.6In0.4Te
L. P. He, Z. Zhang, J. Pan, X. C. Hong, S. Y. Zhou, S. Y. Li
DOI 10.1103/PhysRevB.88.014523 · Physical Review B
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Abstract
The thermal conductivity of a doped topological crystalline insulator, Sn0.6In0.4Te superconducting single crystal with Tc=4.1 K, was measured down to 50 mK. It is found that the residual linear term κ0/T is negligible in zero magnetic field. The κ0/T shows a slow field dependence at low magnetic field. These results suggest that the superconducting gap is nodeless, unless there exist point nodes with directions perpendicular to the heat current. Due to its high-symmetry fcc crystal structure of Sn0.6In0.4Te, however, such point nodes can be excluded. Therefore we demonstrate that this topological superconductor candidate has a full superconducting gap in the bulk. It is likely the unconventional odd-parity A1u state which supports a surface Andreev bound state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sn0.6In0.4Te Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.1 | Pressure not reported | zero_resistance |
| Sn0.6In0.4Te Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
| Sn1-xInxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | unknown |
| Sn1-xInxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.6 | Pressure not reported | unknown |
| CuxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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