Magneto-optical studies of KEr(MoO4)2 in longwave IR region
V. I. Kut’koB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 KharkovYu. N. KharchenkoB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 KharkovN. M. NesterenkoB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 KharkovА. А. СтепановSNCJ, CNRS, 166-X-3 80 42, Grenoble, CEDEX, France
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Transmission spectra have been measured in a KEr(MoO4)2 single crystal in the longwave IR range (14–40 cm−1) at temperatures 4.2 and 2 K in an external magnetic field. Three absorption bands with frequencies 15.4, 26, and 30.5 cm−1 have been observed. It is shown that if the external magnetic field H is oriented parallel to the a-axis of the KEr(MoO4)2 crystal, a kink is observed at Hc∼9 kOe in the frequency-field dependence of the splitting of the 15.4 cm−1 band. It is suggested that this singularity is associated with the structural phase transition induced by an external magnetic field.
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