Conductance of Mesoscopic Systems with Magnetic Impurities

Details Conductance of Mesoscopic Systems with Magnetic Impurities Conductance of Mesoscopic Systems with Magnetic Impurities

2002-10-22

arxiv.org/abs/cond-mat/0210507v1

Phys. Rev. B 67, 115310 (2003).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, 8 figures

Scientific paper

10.1103/PhysRevB.67.115310

We investigate the combined effects of magnetic impurities and applied magnetic field on the interference contribution to the conductance of disordered metals. We show that in a metal with weak spin-orbit interaction, the polarization of impurity spins reduces the rate of electron phase relaxation, thus enhancing the weak localization correction to conductivity. Magnetic field also suppresses thermal fluctuations of magnetic impurities, leading to a recovery of the conductance fluctuations. This recovery occurs regardless the strength of the spin-orbit interaction. We calculate the magnitudes of the weak localization correction and of the mesoscopic conductance fluctuations at an arbitrary level of the spin polarization induced by a magnetic field. Our analytical results for the ``$h/e$'' Aharonov-Bohm conductance oscillations in metal rings can be used to extract spin and gyromagnetic factor of magnetic impurities from existing experimental data.

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