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Probing superconducting phase fluctuations from the current noise spectrum of pseudogaped metal-superconductor tunnel junctions | | Xi Dai
; Tao Xiang
; Tai-Kai Ng
; Zhao-bin Su
; | | Date: |
24 Mar 2000 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | 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. | | Source: | arXiv, cond-mat/0003392 | | Services: | Forum | Review | PDF | Favorites | |
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