Free Magnetic Moments in Disordered Metals

Details Free Magnetic Moments in Disordered Metals Free Magnetic Moments in Disordered Metals

2005-09-09

arxiv.org/abs/cond-mat/0509251v3

Pis'ma v ZhETF, vol 83, 284 (2006); JETP Letters 83, 240 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTex 4.0, 4.3 pages, 4 EPS figures; typos fixed, reference added, final published version

Scientific paper

10.1134/S0021364006060051

The screening of magnetic moments in metals, the Kondo effect, is found to be quenched with a finite probability in the presence of nonmagnetic disorder. Numerical results for a disordered electron system show that the distribution of Kondo temperatures deviates strongly from the result expected from random matrix theory. A pronounced second peak emerges for small Kondo temperatures, showing that the probability that magnetic moments remain unscreened at low temperatures increases with disorder. Analytical calculations, taking into account correlations between eigenfunction intensities yield a finite width for the distribution in the thermodynamic limit. Experimental consequences for disordered mesoscopic metals are discussed.

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