We report here the experimental evidence of semiconductor-superconductor transitions in relatively thick Nb/Al structures. The temperature dependence of resistivity rho(T) shows a sharp superconducting transition followed by either a normal metallic behavior in low-resistivity samples, or a semiconducting behavior when the sample resistivity at 10 K is above 100 mu Omega cm. We discuss here the fabrication conditions and the electron localization regime associated with the measured rho(T) dependence.
Semiconductor-like behavior in superconducting Nb Al films
GRECO, Michela;MENICHETTI, Ezio;
1999-01-01
Abstract
We report here the experimental evidence of semiconductor-superconductor transitions in relatively thick Nb/Al structures. The temperature dependence of resistivity rho(T) shows a sharp superconducting transition followed by either a normal metallic behavior in low-resistivity samples, or a semiconducting behavior when the sample resistivity at 10 K is above 100 mu Omega cm. We discuss here the fabrication conditions and the electron localization regime associated with the measured rho(T) dependence.
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