Journal
PHYSICAL REVIEW B
Volume 99, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.180504
Keywords
-
Funding
- National Key Research & Development Program of China [2016FYA0300402, 2017YFA0302901, 2017YFA0303101]
- National Natural Science Foundation of China [11674279, 11774399, 11374257]
- Zhejiang Provincial Natural Science Foundation of China [LR18A04001]
- Beijing Natural Science Foundation [Z180008]
Ask authors/readers for more resources
We report our point-contact spectroscopy (PCS) study on the superconducting state of the type-II Dirac semimetal PdTe2 with a superconducting transition temperature T-c similar to 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 BardeenCooper-Schrieffer temperature behavior, yielding Delta(0) similar to 0.29 meV and 2 Delta(0)/k(B)T(c), = 4.15 in the strong-coupling regime. A sudden suppression of the superconducting gap in a magnetic field around H-c1 similar to 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 H-c2 similar to 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available