Effect of localized spin fluctuations on the properties of dilute Al-Mn alloys

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Abstract
The theory of localized spin fluctuations (LSF) in dilute nearly-magnetic alloys (e.g. AlMn) due to Hargitai and Corradi is extended to include the renormalization of the spin fluctuation lifetime capital Gamma-1s. In this way the mass renormalization constant, Z1, of the localized electronic states on the impurity site and the inverse LSF lifetime capital Gammas can be related to the fundamental parameters of the Anderson model, viz. the width capital Gamma of the localized electronic states and the Coulomb repulsion U between localized electrons of opposite spin. A numerical calculation shows that Z1 and capital Gammas show no instability at the Hartree-Fock criterion for the formation of a magnetic moment (U/πcapital Gamma = 1). Expressions for the thermodynamic, magnetic and transport properties of such alloys can be written in terms of capital Gammas, Z1, U and capital Gamma. Reasonable numerical values for capital Gammas, Z1, U and capital Gamma are then obtained from experimental data for dilute AlMn alloys.