Observation in TmFeO3 of direct electronic transitions inside the principal multiplet of a rare-earth ion
Balbashov A. M., Volkov A. A., Kozlov G. V., Lebedev S. P., Mukhin A. A., Pronin A. Yu., Prokhorov A. S., Prokhorov A. M.
The far-IR absorption spectra of TmFe03 measured at Γ— 4.2-300 К and ν — 100-1000 GHz have revealed five magnetic-resonance lines. Two of these lines are associated with the antiferromagnetic resonance of the Fe subsystem and the other three lines are associated with the electronic transitions between the lower singlets of the principal multiplet of the Tm3+ ion.