Persistent current induced by magnetic impurities

Details Persistent current induced by magnetic impurities Persistent current induced by magnetic impurities

1997-02-05

arxiv.org/abs/cond-mat/9702045v1

Z. Phys. B 103, 97-103 (1997)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, 7 figures, accepted by Z. Phys. B

Scientific paper

10.1007/s002570050341

We calculate the average persistent current in a normal conducting, mesoscopic ring in the diffusive regime. In the presence of magnetic impurities, a contribution to the persistent current is identified, which is related to fluctuations in the electron spin density. Assuming a spin-flip scattering rate which is comparable to the Thouless energy E_c and low temperature, this new contribution to the persistent current is of the order $I\sim E_c^2/(kT\phi_0)$, which is considerably larger than the persistent current induced by the electron-electron interaction.

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