期刊
PHYSICAL REVIEW B
卷 103, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.214508
关键词
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资金
- National Key Research & Development Program of China [2016YFA0300402, 2017YFA0303101]
- National Natural Science Foundation of China [11674279, 11774305, 11604291, 11374257, 11974306]
- Zhejiang Provincial Natural Science Foundation of China [LR18A04001]
In this study, mechanical point-contact spectroscopy was conducted on single crystalline NbGe2 with a superconducting transition temperature Tc = 2.0-2.1 K. The results suggest that NbGe2 may undergo a transition from a type-I to type-II (possible type-II/1) superconductor at low temperatures.
We report a mechanical point-contact spectroscopy study on the single crystalline NbGe2 with a superconducting transition temperature T-c = 2.0-2.1 K. The differential conductance curves at 0.3 K can be well fitted by a single-gap s-wave Blonder-Tinkham-Klapwijk model and the temperature-dependent gap follows a standard Bardeen-Cooper-Schrieffer behavior, yielding Lambda(0) similar to 0.32 meV and 2 Lambda(0)/k(B)T(c) = 3.62 in the weak-coupling limit. In magnetic field, the superconducting gap at 0.3 K remains constant up to H-c1 similar to 150 Oe and gradually decreases until H-c2 similar to 350 Oe, indicating NbGe2 is going through a transition from a type-I to type-II (possible type-II/1) superconductor at low temperature.
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