Nonperturbative scaling theory of free magnetic moment phases in disordered metals
Abbreviated Journal Title
Phys. Rev. Lett.
RENORMALIZATION-GROUP APPROACH; GAPLESS FERMI SYSTEMS; ANDERSON MODEL; STATIC PROPERTIES; LIQUID BEHAVIOR; KONDO DISORDER; IMPURITIES; TEMPERATURE; SCATTERING; ELECTRONS; Physics, Multidisciplinary
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.
Physical Review Letters
"Nonperturbative scaling theory of free magnetic moment phases in disordered metals" (2007). Faculty Bibliography 2000s. 35.