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arXiv 2009.04890cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-sciphysics.app-ph
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新型应力应变仪及Mn $_3$ Sn单轴应力下热膨胀的测量

A new stress dilatometer and measurement of the thermal expansion under uniaxial stress of Mn$_3$Sn

Muhammad Ikhlas, Kent R. Shirer, Po-Ya Yang, Andrew P. Mackenzie, Satoru Nakatsuji, Clifford W. Hicks

摘要:

我们提出了一种用于测量可调单轴应力下的热膨胀的方法,并显示测量的热膨胀的Mn $_3$锡,室温反铁磁体,表现出自发的霍尔效应,单轴应力高达1.51 GPa的压缩。热膨胀的测量提供了关于相变性质的热力学数据,并且单轴应力提供了不引入无序的强大调谐方法。Mn $_3$ Sn在接近$\sim$ 270 K的温度下表现出热膨胀的异常,这与其磁结构的一阶变化有关。结果表明,沿[0001]方向压缩1.51GPa,相变温度降低到54.6K.我们发现,在过渡的相关熵变是$\sim$ 0.1 J mol $^{-1}$ K $^{-1}$和变化,只有微弱的施加应力。

英文摘要:

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.

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