Jahn–Teller ordering in the Ising magnet KEr(MoO4)2 induced by an external magnetic field
V. I. Kut’koB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences , 310164 Kharkov,M. I. KobetsB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences , 310164 Kharkov,В. А. ПащенкоB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences , 310164 Kharkov,E. N. KhatskoB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences , 310164 Kharkov,
ABI
Аннотация
The EPR spectra of the Ising magnet KEr(MoO4)2 are studied in the frequency interval 18−30 GHz at temperatures 1.8−4.2 K. Measurement of the angular dependence of the EPR spectrum has led to the detection and investigation of the first-order structural phase transition induced in the paramagnet by an external magnetic field. The critical temperature and field corresponding to the phase transition are estimated. A plausible microscopic model of the cooperative Jahn–Teller effect is proposed to explain the observed transition.
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