Conductance of mesoscopic systems with magnetic impurities

Article

关键词: SPIN-GLASSES;    DISORDERED CONDUCTORS;    WEAK LOCALIZATION;    FLUCTUATIONS;    MAGNETORESISTANCE;    SCATTERING;    METALS;    WIRES;    ELECTRONS;    TRANSPORT;   

DOI  :  10.1103/PhysRevB.67.115310

来源: SCIE

【 摘 要 】

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 of 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 the spin and gyromagnetic factor of magnetic impurities from existing experimental data.

【 授权许可】

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