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arXiv · 1804.08471

The Temperature dependence of the magneto-resistance peak in highly disordered superconductors

Adam Doron·Idan Tamir·Tal Levinson·Franzisca Gorniaczyk·Dan Shahar
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Abstract

Highly disordered superconductors have a rich phase diagram. At a moderate magnetic field (B) the samples go through the superconductor-insulator quantum phase transition. In the insulating phase, the resistance increases sharply with B up to a magneto-resistance peak beyond which the resistance drops with B. In this manuscript we follow the temperature (T) evolution of this magneto-resistance peak. We show that as T is reduced, the peak appears at lower B's approaching the critical field of the superconductor-insulator transition. Due to experimental limitations we are unable to determine whether the T=0 limiting position of the peak matches that of the critical field or is at comparable but slightly higher B. We show that, although the peak appears at different B values, its resistance follows an activated T dependence over a large T range with a prefactor that is very similar to the quantum of resistance for cooper-pairs.

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Adam Doron, Idan Tamir, Tal Levinson, Franzisca Gorniaczyk, Dan Shahar. 2018-04-23. The Temperature dependence of the magneto-resistance peak in highly disordered superconductors. https://doi.org/10.1103/physrevb.98.184515

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