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The specific heat of potassium holmium double tungstate |
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| Authors: | M.T. Borowiec V.P. Dyakonov A. Szewczyk M.U. Gutowska T. Zayarnyuk E.E. Zubov |
| Affiliation: | 1. Institute of Physics, Polish Academy of Sciences , Lotników Avenue, 32/46, 02-668 Warsaw, Poland borow@ifpan.edu.pl;3. Institute of Physics, Polish Academy of Sciences , Lotników Avenue, 32/46, 02-668 Warsaw, Poland;4. A.A. Galkin Donetsk Physic-Technical Institute , Donetsk, Ukraine;5. Institute of Physics, Polish Academy of Sciences , Lotników Avenue, 32/46, 02-668 Warsaw, Poland |
| Abstract: | The results of measurements of thermal properties (specific heat) of potassium holmium double tungstate KHo(WO4)2 as a function of temperature (from 0.5 to 300?K) and magnetic field (up to 2?T) are presented. The total specific heat without the phonon and Schottky contributions is found to have the anomaly with maximum at T SPT?～?5?K. This anomaly is likely related with the structural phase transition (SPT) caused by the cooperative Jahn–Teller effect. The increase of specific heat at very low temperatures and its shift towards high temperatures with increasing magnetic field are observed. The origin of this behaviour can be connected with possible magnetic phase transition induced by magnetic field. |
| Keywords: | rare-earth double tungstate specific heat Schottky contribution magnetic phase transition |