论文标题
在单轴应力下，新的应力扩张计和热膨胀的测量
A new stress dilatometer and measurement of the thermal expansion under uniaxial stress of Mn$_3$Sn
论文作者
论文摘要
我们提出了一种测量可调节单轴应力下热膨胀的方法，并显示了Mn $ _3 $ sn的热膨胀的测量，这是一种室温抗fiferromagnet，在单轴应力下表现出自发霍尔的效应，在单轴应力下，高达1.51 GPA压缩。热膨胀的测量提供了有关相变本性质的热力学数据，并且单轴应力提供了一种强大的调谐方法，不引入障碍。 Mn $ _3 $ SN在其热膨胀附近表现出异常，接近$ \ sim $ 270 K，与其磁性结构的一阶变化有关。我们表明，沿[0001]的54.6 K乘1.51 GPA压缩抑制了这种过渡温度。我们发现过渡时相关的熵更改为$ \ sim $ 0.1 j mol $^{ - 1} $ k $^{ - 1} $，并且只会随着施加的压力而微弱。
We present a method for measuring thermal expansion under tunable uniaxial stresses, and show measurements of the thermal expansion of Mn$_3$Sn, a room temperature antiferromagnet that exhibits a spontaneous Hall effect, under uniaxial stresses of up to 1.51 GPa compression. Measurement of thermal expansion provides thermodynamic data about the nature of phase transitions, and uniaxial stress provides a powerful tuning method that does not introduce disorder. Mn$_3$Sn exhibits an anomaly in its thermal expansion near $\sim$270 K, associated with a first-order change in its magnetic structure. We show 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 $\sim$ 0.1 J mol$^{-1}$ K$^{-1}$ and to vary only weakly with applied stress.
