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Andreev-reflection spectroscopy with superconducting indium-A case study.
- Source :
-
Low Temperature Physics . Mar2013, Vol. 39 Issue 3, p252-258. 7p. - Publication Year :
- 2013
-
Abstract
- We have investigated Andreev reflection at interfaces between superconducting indium (Tc = 3.4 K) and several normal conducting nonmagnetic metals (palladium, platinum, and silver) down to T = 0.1 K as well as zinc (Tc = 0.87 K) in its normal state at T = 2.5 K. We analyzed the point-contact spectra with the modified one-dimensional BTK theory valid for ballistic transport. It includes Dynes' quasiparticle lifetime as fitting parameter Γ in addition to superconducting energy gap 2Δ and strength Z of the interface barrier. For contact areas from less than 1 nm2 to 10 000 nm2 the BTK Z-parameter was close to 0.5, corresponding to transmission coefficients of about 80%, independent of the normal metal. The very small variation of Z indicates that the interfaces have a negligible dielectric tunneling barrier. Also Fermi surface mismatch does not account for the observed Z. The extracted value Z ≈ 0.5 can be explained by assuming that practically all of our point contacts are in the diffusive regime. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1063777X
- Volume :
- 39
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Low Temperature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 86405976
- Full Text :
- https://doi.org/10.1063/1.4794999