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  • Giant elastocaloric effect at low temperatures in TmVO4 and implications for cryogenic cooling. Proceedings of the National Academy of Sciences of the United States of America Zic, M. P., Ikeda, M. S., Massat, P., Hollister, P. M., Ye, L., Rosenberg, E. W., Straquadine, J. A., Li, Y., Ramshaw, B. J., Fisher, I. R. 2024; 121 (25): e2320052121

    Abstract

    Adiabatic decompression of paraquadrupolar materials has significant potential as a cryogenic cooling technology. We focus on TmVO[Formula: see text], 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 [Formula: see text] 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 TmVO[Formula: see text], 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.

    View details for DOI 10.1073/pnas.2320052121

    View details for PubMedID 38870056