Critical Metal Phase at the Anderson Metal-Insulator Transition with Kondo Impurities

    Authors

    S. Kettemann; E. R. Mucciolo;I. Varga

    Abbreviated Journal Title

    Phys. Rev. Lett.

    Keywords

    GAPLESS FERMI SYSTEMS; EIGENFUNCTION CORRELATIONS; MAGNETIC-IMPURITIES; DISORDERED METALS; MOBILITY EDGE; BEHAVIOR; LOCALIZATION; DIFFUSION; MOMENTS; ALLOYS; Physics, Multidisciplinary

    Abstract

    It is well known that magnetic impurities can change the symmetry class of disordered metallic systems by breaking spin and time-reversal symmetry. At low temperature, these symmetries can be restored by Kondo screening. It is also known that at the Anderson metal-insulator transition, wave functions develop multifractal fluctuations with power-law correlations. Here, we consider the interplay of these two effects. We show that multifractal correlations open local pseudogaps at the Fermi energy at some random positions in space. When dilute magnetic impurities are at these locations, Kondo screening is strongly suppressed. When the exchange coupling J is smaller than a certain value J(*), the metal-insulator transition point extends to a critical region in the disorder strength parameter and to a band of critical states.

    Journal Title

    Physical Review Letters

    Volume

    103

    Issue/Number

    12

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    4

    WOS Identifier

    WOS:000270139000036

    ISSN

    0031-9007

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