Realization of giant elastocaloric cooling at cryogenic temperatures in TmVO$_4$ via a strain load/unload technique

Mark P. Zic, Linda Ye, Maya H. Martinez, Ian R. Fisher
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Abstract

The adiabatic elastocaloric effect relates changes in the strain that a material experiences to resulting changes in its temperature. While elastocaloric materials have been utilized for cooling in room temperature applications, the use of such materials for cryogenic cooling remains relatively unexplored. Here, we use a strain load/unload technique at low temperatures, similar to those employed at room-temperature, to demonstrate a large cooling effect in TmVO$_4$. For strain changes of $1.8 \cdot 10^{-3}$, the inferred cooling reaches approximately 50% of the material's starting temperature at 5 K, justifying the moniker "giant". Beyond establishing the suitability of this class of material for cryogenic elastocaloric cooling, these measurements also provide additional insight to the entropy landscape in the material as a function of strain and temperature, including the behavior proximate to the quadrupolar phase transition.
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通过应变加载/卸载技术实现 TmVO$_4$ 低温下的巨弹性冷却
绝热弹性热效应将材料所承受的应变变化与材料温度的变化联系起来。虽然绝热弹性材料已被用于室温冷却,但此类材料在低温冷却方面的应用仍相对欠缺。在这里,我们使用与室温下类似的低温下应变加载/卸载技术来证明 TmVO$_4$ 的巨大冷却效应。当应变变化为 1.8 \cdot 10^{-3}$ 时,推断的冷却效果约为材料在 5 K 时起始温度的 50%,这也证明了 "巨型 "这一称号的正确性。除了确定该类材料适用于低温弹性热制冷之外,这些测量还提供了更多关于材料内作为应变和温度函数的熵分布的见解,包括接近四极相变的行为。
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