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Measurements of electrodynamic response of of spin glass AuFe films incomparison with pure gold films are performed at frequencies from 0.3 THz (10cm-1) up to 1000 THz (33000 cm-1) using different spectroscopic methods. Atroom temperatures the spectra of pure gold and of AuFe are typically metallicwith the scattering rate of carriers in AuFe being significantly enlarged dueto scattering on localized magnetic moments of Fe ions. In the spin-glass phaseof AuFe at T = 5 K a pseudogap in the conductivity spectrum is detected withthe magnitude close to the Ruderman-Kittel-Kasuya-Yosida (RKKY) energy forAuFe: Delta(RKKY) = 2.2 meV. The origin of the pseudogap is associated withpartial localization of electrons which mediate the RKKY interaction betweenlocalized magnetic Fe centers.Comment: 7 pages, 3 figures, 1 tabl

Charge localization due to RKKY interaction in the spin-glass AuFe