In this article, we briefly introduce novel elastocaloric effects in Co_2Cr(Al,Si) Heusler alloys. This alloy system exhibits a unique behavior where the phase stability changes in the order of L2_1 → D0_(22) →L2_1 during the cooling process. By applying uniaxial stress, the martensite phase can be induced from both the high-temperature normal and low-temperature reentrant parent phases. As a result, not only the entropy change, but also the change in adiabatic temperature alters its sign as the temperature varies, which is called the "elastocaloric switching effect". We hope the findings in this work can provide new possibilities for the design of elastocaloric cooling systems, which are considered to be environmentally-friendly future technologies.
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