Abstract
We report a study of the temperature dependence, down to 30 mK, of the magnetoresistance of Cd-Sb alloy in the insulating phase obtained by annealing the quenched metallic superconducting ( T c ≈4.5 K) phase of the alloy. Even though the sample in this state is no longer superconducting, the observed negative magnetoresistance points to single-particle tunneling in the presence of a superconducting gap in the spectrum. At magnetic fields B<T the ratio α(T,B)=R(T,B)/R(T,B=4 T)is found to be maximum at a temperature of about 0.1 K. This behavior indicates a change of the conductivity mechanism from single-particle tunneling to incoherent two-particle tunneling as the temperature decreases.
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Pis’ma Zh. Éksp. Teor. Fiz. 64, No. 10, 713–718 (25 November 1996)
Published in English in the original Russian Journal. Edited by Steve Torstveit.
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Gantmakher, V.F., Zverev, V.N., Dolgopolov, V.T. et al. Pair tunneling in the low-temperature conductivity of the Cd-Sb alloy high-resistance state near the superconductor-insulator transition. Jetp Lett. 64, 767–773 (1996). https://doi.org/10.1134/1.567295
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DOI: https://doi.org/10.1134/1.567295