Single full gap with mixed type-I and type-II superconductivity on surface of the type-II Dirac semimetal PdTe2 by point-contact spectroscopy
Tian Le, Lichang Yin, Zili Feng, Qi Huang, Liqiang Che, Jie Li, Youguo Shi, Xin Lu
DOI 10.1103/PhysRevB.99.180504 · Physical Review B
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Abstract
We report our point-contact spectroscopy (PCS) study on the superconducting state of the type-II Dirac semimetal PdTe2 with a superconducting transition temperature Tc∼1.65 K. Both mechanical- and soft-PCS differential conductance curves at 0.3 K show a consistent double-peak structure and they can be perfectly fitted by a single s-wave gap based on the Blonder-Tinkham-Klapwijk model. The gap follows a typical Bardeen-Cooper-Schrieffer temperature behavior, yielding Δ0∼0.29 meV and 2Δ0/kBTc=4.15 in the strong-coupling regime. A sudden suppression of the superconducting gap in a magnetic field around Hc1∼130 Oe is observed for most point contacts on PdTe2, characteristic of a first-order transition for type-I superconductors in field. However, for other contacts, a smooth evolution of the PCS conductance persists up to Hc2∼600 Oe, signaling a local type-II superconductivity. The observed admixture of type-I and type-II superconductivity can possibly arise from an inhomogeneous electron mean free path on the surface of PdTe2 due to its topological surface states.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PdTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.65 | Pressure unresolved | onset |
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