INFLUENCE OF FERROMAGNETIC SPIN-WAVES ON PERSISTENT CURRENTS IN ONE-DIMENSIONAL MESOSCOPIC RINGS

The influence of the electron-magnon and the electron-phonon interacti ons on the persistent current in a one-dimensional mesoscopic ring is studied. We show that, due to the electron-magnon interaction, the amp litude of the persistent current is exponentially reduced compared to the free case, Two features occur in the presence of an electron-phono n interaction. For the normal state of electrons, the persistent curre nt is weakened by the Debye-Waller factor. Considering the so-called P eierls distortions, we show that the effect of the Peierls instability on the amplitude of the persistent current (i.e., the oscillation wit h respect to the flux) is suppressed significantly and the persistent current will be practically undetectable in the case of a wide-gap Pei erls material.