Magnons and crystal field transitions in hexagonal REMnO3 (RE = Er, Tm,
Yb, Lu) single crystals
release_xd4lafvewjatfnw6kzksprgp6y
by
E. C. Standard,
T. Stanislavchuk,
A. A. Sirenko,
N. Lee,
S.-W.
Cheong
2012
Abstract
Far-infrared optical transmission spectra of the antiferromagnetic
resonances, or magnons, and crystal field transitions have been studied in
hexagonal REMnO3 (RE = 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 K and 100 K. The magnon frequency increases systematically with a
decrease of the RE ion radius. The magnetic ordering of RE ions (RE=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 main magnetic
interactions in the system including exchange of the Mn3+ spins with RE3+
paramagnetic moments.
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