Article

Magnons and crystal field transitions in hexagonal REMnO3 (RE = Er, Tm, Yb, Lu) single crystals

02/2012;
Source: arXiv

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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Keywords

crystal field transitions
 
effective g-factors
 
Far-infrared optical transmission spectra
 
ions
 
low temperatures T<3.5 K
 
Lu
 
magnon
 
magnon frequency increases
 
magnons
 
paramagnetic moments
 
temperature range
 
Tm
 
Yb