Magnons and crystal-field transitions in hexagonal RMnO 3 (R = Er, Tm, Yb, Lu) single crystals

E. C. Standard, T. Stanislavchuk, A. A. Sirenko, N. Lee, S. W. Cheong

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Abstract

Far-infrared optical transmission spectra of the antiferromagnetic resonances, or magnons, and crystal-field (CF) transitions have been studied in hexagonal RMnO 3 (R = Er, Tm, Yb, Lu) single crystals. The magnon and CF frequencies, their oscillator strengths, and effective g factors have been measured using external magnetic fields up to 9 T in the temperature range between 1.5 and 100 K. The magnon frequency increases systematically with a decrease of the R ion radius. The magnetic ordering of R ions (R = Er, Tm, Yb) was observed at low temperatures T<3.5 K and in strong external magnetic fields. The observed effects are analyzed taking into account the main magnetic interactions in the system including exchange of the Mn3 + spins with R3 + paramagnetic moments.

Original languageEnglish (US)
Article number144422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number14
DOIs
StatePublished - Apr 23 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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