Giant elastocaloric effect at low temperatures in TmVO4 and implications for cryogenic cooling.
Proc Natl Acad Sci U S A
; 121(25): e2320052121, 2024 Jun 18.
Article
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| MEDLINE
| ID: mdl-38870056
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.
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Colección:
01-internacional
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MEDLINE
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En
Revista:
Proc Natl Acad Sci U S A
Año:
2024
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Article