Chiral susceptibility in canonical spin glass and re-entrant alloys from Hall effect measurementsP. 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 and and of an archetype re-entrant system 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