Charge Localization due to RKKY Interaction in the Spin Glass AuFe

Details Charge Localization due to RKKY Interaction in the Spin Glass AuFe Charge Localization due to RKKY Interaction in the Spin Glass AuFe

2006-09-21

arxiv.org/abs/cond-mat/0609547v1

Europhys. Lett. 76, 938 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures, 1 table

Scientific paper

10.1209/epl/i2006-10339-6

Measurements of electrodynamic response of of spin glass AuFe films in comparison with pure gold films are performed at frequencies from 0.3 THz (10 cm-1) up to 1000 THz (33000 cm-1) using different spectroscopic methods. At room temperatures the spectra of pure gold and of AuFe are typically metallic with the scattering rate of carriers in AuFe being significantly enlarged due to scattering on localized magnetic moments of Fe ions. In the spin-glass phase of AuFe at T = 5 K a pseudogap in the conductivity spectrum is detected with the magnitude close to the Ruderman-Kittel-Kasuya-Yosida (RKKY) energy for AuFe: Delta(RKKY) = 2.2 meV. The origin of the pseudogap is associated with partial localization of electrons which mediate the RKKY interaction between localized magnetic Fe centers.

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