Andreev reflections on a MgB2 superconductor
D. K. Aswal, Shashwati Sen, S. C. Gadkari, Ajay Singh, S. K. Gupta, L. C. Gupta, A. Bajpai, A. K. Nigam
DOI 10.1103/PhysRevB.66.012513 · Physical Review B
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Abstract
An Andreev-reflection study of MgB2/Ag planar junctions as a function of temperature and magnetic field is reported. The differential resistance (dV/dI) versus voltage (V) characteristics exhibited a distinct double minimum feature. This, together with a comparison of Blonder-Tinkham-Klapwijk theory of isotropic superconductor, indicates that data are not consistent with the weak-coupling BCS theory. This is further supported by unusual temperature and magnetic-field dependence of the tunneling characteristics. The results are discussed using various existing theories.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39.4 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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