Point-contact Andreev reflection spectroscopy on the misfit phase superconductors (PbSe)1.12(TaSe2) doped with Cl or Br
Liqiang Che, Tian Le, Qi Huang, Lichang Yin, Ye Chen, Xiaohui Yang, Zhu-An Xu, Xin Lu
DOI 10.1103/PhysRevB.99.024512 · Physical Review B
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Abstract
We report point-contact Andreev reflection spectroscopy studies on possible topological superconductor candidates Cl- (Br-) doped (PbSe)1.12(TaSe2) with superconducting transition temperature Tc∼ 1.2 K. A common double-peak feature is observed for the conductance curves at low temperature in the absence of a zero-bias conductance peak. We analyze conductance curves with the Blonder-Tinkham-Klapwijk model and the extracted superconducting gap follows a typical Bardeen-Cooper-Schrieffer temperature- and field-dependent behavior, with 2Δ0/kBTc≈3.7 and 3.8 for Cl and Br doping, respectively. Our results strongly suggest that both Cl- and Br-doped (PbSe)1.12(TaSe2) are fully gapped superconductors in an intermediate-coupling regime.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb1.12Ta(Se0.92Cl0.08)3.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.25 | Pressure not reported | onset |
| Pb1.12Ta(Se0.92Br0.08)3.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | onset |
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