Terahertz spectroscopy of AuFe spin glasses

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • A. S. Prokhorov - , RAS - General Physics Institute (Author)
  • V. B. Anzin - , RAS - General Physics Institute (Author)
  • D. A. Vitukhnovskiǐ - , 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)
  • S. Vongtragool - , Leiden University (Author)
  • M. B.S. Hesselberth - , Leiden University (Author)
  • J. Aarts - , Leiden University (Author)
  • G. J. Nieuwenhuys - , Leiden University (Author)
  • M. Dumm - , University of Stuttgart (Author)
  • D. Faltermeier - , University of Stuttgart (Author)
  • S. Kaiser - , University of Stuttgart (Author)
  • S. Yasin - , University of Stuttgart (Author)
  • M. Dressel - , University of Stuttgart (Author)
  • N. Drichko - , University of Stuttgart, RAS - Ioffe Physico Technical Institute (Author)

Abstract

The electrodynamic response of spin glasses (in the form of thin AuFe films) in the terahertz frequency range has been studied using backward-wave oscillator (BWO) spectroscopy (10-40 cm-1) and optical ellipsometry (5000-33000 cm-1) techniques at temperatures from 5 to 295 K. The room-temperature dynamic conductivity spectra of AuFe films are typical of metals and can be described within the framework of the Drude theory of conduction by free charge carriers. Changes in the microscopic parameters of charge carriers in AuFe films with increasing iron content, which are related to additional scattering of carriers on the impurity magnetic moments, have been studied on the quantitative level, including the carrier relaxation frequency and characteristic time, plasma frequency, and conductivity. It is established that the spin-glass phase at a temperature of 5 K exhibits dispersion of the conductivity in the frequency range 10-40 cm-1, which can be related to the appearance of a mobility gap in the subsystem of free electrons involved in the RKKY interaction between magnetic centers (Fe atoms).

Details

Original languageEnglish
Pages (from-to)887-896
Number of pages10
JournalJournal of Experimental and Theoretical Physics
Volume103
Issue number6
Publication statusPublished - Dec 2006
Peer-reviewedYes
Externally publishedYes

External IDs

ORCID /0000-0001-9862-2788/work/142255419

Keywords

ASJC Scopus subject areas