Giant elastocaloric effect at low temperatures in TmVO$_4$ and implications for cryogenic cooling
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911925409939456 |
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| author | Zic, Mark P. Ikeda, Matthias S. Massat, Pierre Hollister, Patrick M. Ye, Linda Rosenberg, Elliott W. Straquadine, Joshua A. W. Ramshaw, Brad J. Fisher, Ian R. |
| author_facet | Zic, Mark P. Ikeda, Matthias S. Massat, Pierre Hollister, Patrick M. Ye, Linda Rosenberg, Elliott W. Straquadine, Joshua A. W. Ramshaw, Brad J. Fisher, Ian R. |
| contents | Adiabatic decompression of para-quadrupolar materials has significant potential as a cryogenic cooling technology. We focus on TmVO$_4$, 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 $k_B \ln{2}$ 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 coefficient of single-crystal TmVO$_4$, 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 to the dynamic quadrupole strain susceptibility. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_15577 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Giant elastocaloric effect at low temperatures in TmVO$_4$ and implications for cryogenic cooling Zic, Mark P. Ikeda, Matthias S. Massat, Pierre Hollister, Patrick M. Ye, Linda Rosenberg, Elliott W. Straquadine, Joshua A. W. Ramshaw, Brad J. Fisher, Ian R. Strongly Correlated Electrons Materials Science Adiabatic decompression of para-quadrupolar materials has significant potential as a cryogenic cooling technology. We focus on TmVO$_4$, 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 $k_B \ln{2}$ 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 coefficient of single-crystal TmVO$_4$, 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 to the dynamic quadrupole strain susceptibility. |
| title | Giant elastocaloric effect at low temperatures in TmVO$_4$ and implications for cryogenic cooling |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2308.15577 |