Charge localization due to RKKY interaction in the spin-glassB. Gorshunov1, 2, A. S. Prokhorov2, S. Kaiser1, D. Faltermeier1, S. Yasin1, M. Dumm1, N. Drichko1, 3, E. S. Zhukova2, I. E. Spektor2, S. Vongtragool4, 5, M. B. S. Hesselberth4, J. Aarts4, G. J. Nieuwenhuys4, 5 and M. Dressel1
1 1. Physikalisches Institut, Universität Stuttgart - 70550 Stuttgart, Germany
2 Prokhorov General Physics Institute, Russian Academy of Sciences - Moscow, Russia
3 Ioffe Physico-Technical Institute - St. Petersburg, Russia
4 Kamerlingh Onnes Laboratory, Leiden University - Leiden, The Netherlands
5 Research Department Condensed Matter Research with Neutrons und Muyons Paul Scherrer Institute - Villigen, Switzerland
received 21 September 2006; accepted 5 October 2006
published online 1 November 2006
Measurements of the electrodynamic response of spin-glass films in comparison with pure gold films are performed at frequencies from 0.3 ( ) up to 1000 ( ) using different spectroscopic methods. At room temperature the spectra of pure gold and of are typically metallic with the scattering rate of carriers in being significantly enlarged due to scattering on localized magnetic moments of Fe ions. In the spin-glass phase of at a pseudogap in the conductivity spectrum is detected with the magnitude close to the Ruderman-Kittel-Kasuya-Yosida (RKKY) energy for : . The origin of the pseudogap is associated with partial localization of electrons which mediate the RKKY interaction between localized magnetic Fe centers.
75.50.Lk - Spin glasses and other random magnets.
71.55.Jv - Disordered structures; amorphous and glassy solids.
72.15.Rn - Localization effects (Anderson or weak localization).
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