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Probing Pseudogap by Josephson Tunneling

Ivar Martin·Alexander Balatsky
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Abstract

We propose here an experiment aimed to determine whether there are superconducting pairing fluctuations in the pseudogap regime of the high-$T_c$ materials. In the experimental setup, two samples above $T_c$ are brought into contact at a single point and the differential AC conductivity in the presence of a constant applied bias voltage between the samples, $V$, should be measured. We argue the the pairing fluctuations will produce randomly fluctuating Josephson current with zero mean, however the current-current correlator will have a characteristic frequency given by Josephson frequency $ω_J = 2 e V /\hbar$. We predict that the differential AC conductivity should have a peak at the Josephson frequency with the width determined by the phase fluctuations time.

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Ivar Martin, Alexander Balatsky. 2000-02-03. Probing Pseudogap by Josephson Tunneling. https://doi.org/10.1103/physrevb.62.r6124

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