Probing Pseudogap by Josephson Tunneling

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 ${\omega }_J=2eV/\hslash$. We predict that the differential AC conductivity should have a peak at the Josephson frequency with the width determined by the phase fluctuations time.

4 pages, 2 eps figures

References in corpus (1)

• The pseudogap in high-temperature superconductors: an experimental survey

Cited by in corpus (8)

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• Competition between superconductivity and spin density wave
• Resonant tunneling of fluctuation Cooper pairs