Probing superconducting phase fluctuations from the current noise spectrum of pseudogaped metal-superconductor tunnel junctions

Abstract

We study the current noise spectra of a tunnel junction of a metal with strong pairing phase fluctuation and a superconductor. It is shown that there is a characteristic peak in the noise spectrum at the intrinsic Josephson frequency ${\omega }_J=2eV$ when ${\omega }_J$ is smaller than the pairing gap but larger than the pairing scattering rate. In the presence of an AC voltage, the tunnelling current noise shows a series of characteristic peaks with increasing DC voltage. Experimental observation of these peaks will give direct evidence of the pair fluctuation in the normal state of high-$T_c$ superconductors and from the half width of the peaks the pair decay rate can be estimated.

4 pages, 3 figures

References in corpus (2)

• Multiple Andreev reflections and enhanced shot noise in diffusive SNS junctions
• Josephson Frequency Singularity in the Noise of Normal Metal-Superconductor Junctions

Cited by in corpus (2)

• Josephson current noise above Tc in superconducting tunnel junctions
• Incoherent pair tunneling in the pseudogap phase of cuprates