Full superconducting gap and type-I to type-II superconductivity transition in single crystalline NbGe2
Dongting Zhang, Tian Le, Baijiang Lv, Lichang Yin, Chufan Chen, Zhiyong Nie, Dajun Su, Huiqiu Yuan, Zhu-An Xu, Xin Lu
DOI 10.1103/PhysRevB.103.214508 · Physical Review B
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Abstract
We report a mechanical point-contact spectroscopy study on the single crystalline NbGe2 with a superconducting transition temperature Tc=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 Δ0∼0.32 meV and 2Δ0/kBTc=3.62 in the weak-coupling limit. In magnetic field, the superconducting gap at 0.3 K remains constant up to Hc1∼150 Oe and gradually decreases until Hc2∼350 Oe, indicating NbGe2 is going through a transition from a type-I to type-II (possible type-II/1) superconductor at low temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.05 | Pressure not reported | onset |
| NbGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.05 | Pressure not reported | onset |
| NbGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.05 | Pressure not reported | onset |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BiPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| ZrB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaRhSi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| PdTe2 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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