Spin Magnetism in Mesoscopic Metals

概要

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Fluctuation of spin magnetic susceptibility √<<δχ^2_S>> in mesoscopic metals is discussed in comparison with that of orbital magnetic susceptibility √<<δχ^2_L>>. It is found that a ratio √<<δχ^2_S>>/√<<δχ^2_L>> is independent of temperature and the boundary condition and has a magnitude of the order of (1/ε_Fτ)^2 which is much smaller than unity, ε_F and τ being Fermi energy and the relaxation time of the elastic scattering, respectively. Scattering dependent on electron spin (e.g., spin-orbit interaction or scattering by impurity spin in the glass state) are shown to suppress √<<δχ^2_S>> far more strongly than √<<δχ^2_L>>. The results indicate that the anomalously large fluctuation of the magnetic susceptibility compared to the average, which is expected to be observed experimentally, results from the orbital motion.
社団法人日本物理学会の論文
1994-02-15