Title

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

Authors

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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