A tunable stress dilatometer and measurement of the thermal expansion under uniaxial stress of Mn3Sn
A tunable stress dilatometer and measurement of the thermal expansion under uniaxial stress of Mn3Sn
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DOI：
10.1063/5.0029198
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发表时间：
2020-12
影响因子：
4
通讯作者：
M. Ikhlas;K. Shirer;Po-Ya Yang;A. Mackenzie;S. Nakatsuji;C. Hicks
中科院分区：
文献类型：
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作者：
M. Ikhlas;K. Shirer;Po-Ya Yang;A. Mackenzie;S. Nakatsuji;C. Hicks
我们提出了一种测量可调单轴应力下热膨胀的方法，并展示了室温反铁磁体Mn3Sn在高达1.51 GPa压缩的单轴应力下热膨胀的测量结果。热膨胀的测量提供了有关相变性质的热力学数据，而单轴应力提供了一种不引入无序的强大调谐方法。在~ 270 K附近，Mn3Sn表现出异常的热膨胀，这与其磁性结构的一阶变化有关。我们发现这个转变温度被沿[0001]的1.51 GPa压缩抑制了54.6 K。我们发现在跃迁时相关的熵变为~ 0.1 J mol−1 K−1，并且随外加应力的变化很小。
We present a method for measuring thermal expansion under tunable uniaxial stresses and show measurements of the thermal expansion of Mn3Sn, a room temperature antiferromagnet that exhibits a spontaneous Hall effect, under uniaxial stresses of up to 1.51 GPa compression. The measurement of thermal expansion provides thermodynamic data about the nature of phase transitions, and uniaxial stress provides a powerful tuning method that does not introduce disorder. Mn3Sn exhibits an anomaly in its thermal expansion near ∼270 K, associated with a first-order change in its magnetic structure. We show that this transition temperature is suppressed by 54.6 K by 1.51 GPa compression along [0001]. We find the associated entropy change at the transition to be ∼ 0.1 J mol−1 K−1 and to vary only weakly with applied stress.