Nonperturbative scaling theory of free magnetic moment phases in disordered metals

    Authors

    A. Zhuravlev; I. Zharekeshev; E. Gorelov; A. I. Lichtenstein; E. R. Mucciolo;S. Kettemann

    Comments

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    Abbreviated Journal Title

    Phys. Rev. Lett.

    Keywords

    RENORMALIZATION-GROUP APPROACH; GAPLESS FERMI SYSTEMS; ANDERSON MODEL; STATIC PROPERTIES; LIQUID BEHAVIOR; KONDO DISORDER; IMPURITIES; TEMPERATURE; SCATTERING; ELECTRONS; Physics, Multidisciplinary

    Abstract

    The crossover between a free magnetic moment phase and a Kondo phase in low-dimensional disordered metals with dilute magnetic impurities is studied. We perform a finite-size scaling analysis of the distribution of the Kondo temperature obtained from a numerical renormalization group calculation of the local magnetic susceptibility for a fixed disorder realization and from the solution of the self-consistent Nagaoka-Suhl equation. We find a sizable fraction of free (unscreened) magnetic moments when the exchange coupling falls below a critical value J(c). Between the free moment phase due to Anderson localization and the Kondo-screened phase we find a phase where free moments occur due to the appearance of random local pseudogaps at the Fermi energy whose width and power scale with the elastic scattering rate 1/tau.

    Journal Title

    Physical Review Letters

    Volume

    99

    Issue/Number

    24

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    4

    WOS Identifier

    WOS:000251674300054

    ISSN

    0031-9007

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