Vortex overlapping in a BCS type-II superconductor revealed by Andreev reflection spectroscopy
L. Shan, Y. Huang, C. Ren, H. H. Wen
DOI 10.1103/PhysRevB.73.134508 · Physical Review B
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Abstract
The point-contact Andreev reflection spectroscopy for a simple BCS type-II superconductor was investigated in pure niobium (Nb). The small broadening factor of Γ∕Δ(0)<0.09 was achieved by careful preparation of the junctions. Then we attempted to use the recently proposed two-channel model [Phys. Rev. B 72, 012502 (2005)] to explain the spectra measured in various magnetic fields for such low-Γ case. It was found that this rigid vortex core model is appropriate below a crossover field H*, above which it is not adequate due to the onset of substantial vortex overlapping effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.25 | Pressure not reported | onset |
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