2006/09/21 by B Gorshunov, B. Gorshunov, A. S Prokhorov +25
Engineering · Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Metallic Glasses and Amorphous Alloys #Theoretical and Computational Physics #cond-mat.other #cond-mat.str-el
paper · pdf · doi:10.1209/epl/i2006-10339-6
published as Europhys. Lett. 76, 938 (2006) · 7 pages, 3 figures, 1 table
arxiv created 2006/09/21 · openalex publication_date 2006/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Measurements of the electrodynamic response 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 temperature 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: Δ 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.