Cálculo, via grupo de renormalização, da relaxação nuclear de uma impureza em meio metálico. / Renormalization group calculation of nuclear spin-lattice relaxation for one impurity in a metal.

AUTOR(ES)
DATA DE PUBLICAÇÃO

1989

RESUMO

The nuclear magnetic relaxation rate for an impurity in a metallic environment has been calculated as a function of temperature. Our calculations are based on the spin-degenerate Anderson model originally developed to describe dilute magnetic alloys. The relevance to heavy férmions, Valence fluctuation, and chemisorption on metallic surfaces is discussed. The temperature dependent rates exhibit peaks in qualitative agreement with experimental results. As expected, in the limit T → 0 the rates are proportional to the temperature, even for cases in which many-body effects invalidate the classical derivation of the Korringa Law. The linear coefficient is shown to be proportional to the square of the zero temperature suscetibility; this generalizes a relation derived by Shiba in the Kondo limit.

ASSUNTO(S)

grupo de renormalização renormalization group relaxação spin-rede kondo effect efeito kondo modelo de anderson anderson model spin-lattice relaxation

ACESSO AO ARTIGO

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