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- W2045303438 abstract "We consider the contribution of superconducting fluctuations to the mesoscopic persistent current (PC) of an ensemble of normal metallic rings, made of a superconducting material whose low bare transition temperature $T^{0}_{c}$ is much smaller than the Thouless energy $E_{c}$. The effect of pair breaking is introduced via the example of magnetic impurities. We find that over a rather broad range of pair-breaking strength $hbar/tau_{s}$, such that $T_c^0 lesssim hbar/tau_s lesssim E_c$, the superconducting transition temperature is normalized down to minute values or zero while the PC is hardly affected. This may provide an explanation for the magnitude of the average PC's in copper and gold, as well as a way to determine their $T^0_c$'s. The dependence of the current and the dominant superconducting fluctuations on $E_ctau_s$ and on the ratio between $E_c$ and the temperature is analyzed. The measured PC's in copper (gold) correspond to $T^0_c$ of a few (a fraction of) mK." @default.
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- W2045303438 date "2009-07-16" @default.
- W2045303438 modified "2023-09-23" @default.
- W2045303438 title "Pair-breaking effect on mesoscopic persistent currents" @default.
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- W2045303438 doi "https://doi.org/10.1103/physrevb.80.024509" @default.
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