Charge Localization due to RKKY Interaction in the Spin Glass AuFe
B. Gorshunov, A.S. Prokhorov, S. Kaiser, D. Faltermeier, S. Yasin, M., Dumm, N. Drichko, E.S. Zhukova, I.E. Spektor, S. Vongtragool, M.B.S., Hesselberth, J. Aarts, G.J. Nieuwenhuys, and M. Dressel
TL;DR
This study investigates how RKKY interactions cause charge localization in AuFe spin glass films, revealing a pseudogap in conductivity spectra at low temperatures linked to electron localization.
Contribution
It provides experimental evidence of charge localization due to RKKY interaction in AuFe spin glasses through broadband spectroscopy measurements.
Findings
Detection of a pseudogap at 5 K close to RKKY energy
Enlarged scattering rate in AuFe due to magnetic moments
Partial electron localization mediating magnetic interactions
Abstract
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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