Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates

M. N. Popova, K. N. Boldyrev, S. A. Klimin, T. N. Stanislavchuk, A. A. Sirenko, L. N. Bezmaternykh

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm-1 for the electron-phonon coupling constant in PrFe3(BO3)4.

Original languageEnglish (US)
Pages (from-to)250-254
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume383
DOIs
StatePublished - Jun 1 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Keywords

  • Electron-phonon coupling
  • Optical spectroscopy
  • Rare-earth iron borates
  • Spin-phonon interactions

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