RKKY interaction and a pseudo-gap in terahertz conductivity spectra of the AuFe spin glass

Research output: Contribution to journalResearch articleContributedpeer-review


  • A. S. Prokhorov - , RAS - General Physics Institute (Author)
  • E. S. Zhukova - , RAS - General Physics Institute (Author)
  • I. E. Spektor - , RAS - General Physics Institute (Author)
  • B. P. Gorshunov - , RAS - General Physics Institute (Author)
  • M. B.S. Hesselberth - , Leiden University (Author)
  • J. Aarts - , Leiden University (Author)
  • G. J. Nieuwenhuys - , Leiden University (Author)
  • S. Kaiser - , University of Stuttgart (Author)
  • M. Dressel - , University of Stuttgart (Author)


Methods of terahertz BWT spectroscopy and optical ellipsometry in the range of frequencies from 0.3 THz to 1000 THz (10-33000 cm-1) at temperatures of 5-300 K were used for the first time to measure spectra of the electrodynamic response of a spin glass of composition Au-Fe (6 at % Fe). In the spin-glass state, at T < 100 K, dispersion of the dynamic conductivity has been discovered in the vicinity of a frequency of 0.5 THz, whose origin is ascribed to the appearance of a mobility gap in the subsystem of free electrons involved into RKKY interaction between the magnetic centers of Fe. It has been established that at 300 K the spectra of Au and AuFe have a shape typical of metals; the microscopic parameters of charge carriers, i.e., the relaxation frequency and plasma frequency, have been determined.


Original languageEnglish
Pages (from-to)247-252
Number of pages6
JournalPhysics of Metals and Metallography
Issue number3
Publication statusPublished - Sept 2008
Externally publishedYes

External IDs

ORCID /0000-0001-9862-2788/work/142255407