Effect of pair-breaking on mesoscopic persistent currents well above the superconducting transition temperature

Details Effect of pair-breaking on mesoscopic persistent currents well above the superconducting transition temperature Effect of pair-breaking on mesoscopic persistent currents well above the superconducting transition temperature

2008-04-04

arxiv.org/abs/0804.0702v1

Phys. Rev. Lett. 101, 057001 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.101.057001

We consider the mesoscopic normal persistent current (PC) in a very low-temperature superconductor with a bare transition temperature $T_c^0$ much smaller than the Thouless energy $E_c$. We show that in a rather broad range of pair-breaking strength, $T_c^0 \lesssim \hbar/\tau_s \lesssim E_c$, the transition temperature is renormalized to zero, but the PC is hardly affected. This may provide an explanation for the magnitude of the average PC's in the noble metals, as well as a way to determine their $T_c^0$'s.

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