1. Giant elastocaloric effect at low temperatures in TmVO4 and implications for cryogenic cooling.
- Author
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Zic, Mark P., Ikeda, Matthias S., Massat, Pierre, Hollister, Patrick M., Ye, Linda, Rosenberg, Elliott W., Straquadine, Joshua A. W., Yuntian Li, Ramshaw, B. J., and Fisher, Ian R.
- Subjects
PHASE transitions ,LOW temperatures ,TEMPERATURE effect ,COOLING ,ELECTRIC fields - Abstract
Adiabatic decompression of paraquadrupolar materials has significant potential as a cryogenic cooling technology. We focus on TmVO4, an archetypal material that undergoes a continuous phase transition to a ferroquadrupole-ordered state at 2.15 K. Above the phase transition, each Tm ion contributes an entropy of kB ln 2 due to the degeneracy of the crystal electric field groundstate. Owing to the large magnetoelastic coupling, which is a prerequisite for a material to undergo a phase transition via the cooperative Jahn--Teller effect, this level splitting, and hence the entropy, can be readily tuned by externally induced strain. Using a dynamic technique in which the strain is rapidly oscillated, we measure the adiabatic elastocaloric response of single-crystal TmVO4, and thus experimentally obtain the entropy landscape as a function of strain and temperature. The measurement confirms the suitability of this class of materials for cryogenic cooling applications and provides insight into the dynamic quadrupole strain susceptibility. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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