Europhys. Lett.
Volume 66, Number 3, May 2004
Page(s) 419 - 422
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 April 2004
Europhys. Lett., 66 (3) , pp. 419-422 (2004)
DOI: 10.1209/epl/i2003-10222-0

Concentration dependence of the transition temperature in metallic spin glasses

R. Serral Gracià1, Th. M. Nieuwenhuizen1 and I. V. Lerner2

1  University of Amsterdam, Institute for Theoretical Physics Valckenierstraat 65, 1018XE Amsterdam, The Netherlands
2  School of Physics and Astronomy, University of Birmingham Edgbaston, Birmingham B152TT, UK

(Received 21 November 2003; accepted 2 March 2004)

The dependence of the transition temperature $T_{\ab{g}}$ in terms of the concentration of magnetic impurities c in spin glasses is explained on the basis of a screened RKKY interaction. The two observed power laws, $T_{\ab{g}} \sim c$ at low c and $T_{\ab{g}} \sim c^{2/3}$ for intermediate c, are described in a unified approach.

75.10.Nr - Spin-glass and other random models.
75.50.Lk - Spin glasses and other random magnets.

© EDP Sciences 2004