Europhys. Lett.
Volume 67, Number 1, July 2004
Page(s) 123 - 129
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 June 2004
Europhys. Lett., 67 (1) , pp. 123-129 (2004)
DOI: 10.1209/epl/i2004-10042-8

Chiral susceptibility in canonical spin glass and re-entrant alloys from Hall effect measurements

P. Pureur1, F. Wolff Fabris1, J. Schaf1 and I. A. Campbell2

1  Instituto de Física, Universidade Federal do Rio Grande do Sul Caixa Postal 15051, 91501-970 Porto Alegre, RS, Brazil
2  Laboratoire des Verres, Université Montpellier II 34095 Montpellier, France

(Received 12 March 2004; accepted in final form 29 April 2004)

The extraordinary Hall effect coefficients Rs(T) of the canonical spin glass alloys $\mathbf{Au}Fe~8\tx{at}\%$ and $\mathbf{Au}Mn~8\tx{at}\%$ and of an archetype re-entrant system $\mathbf{Au}Fe~18\tx{at}\%$ were measured as functions of temperature. The data show a critical cusp-like term superimposed on a smooth background for the spin glasses, and change of sign with temperature for the re-entrant. The results can be interpreted consistently by invoking a chiral Hall effect contribution as proposed by Kawamura.

75.50.Lk - Spin glasses and other random magnets.
75.47.-m - Magnetotransport phenomena; materials for magnetotransport.
75.25.+z - Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.).

© EDP Sciences 2004