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arXiv · 2009.04890

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
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Abstract

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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Muhammad Ikhlas, Kent R. Shirer, Po-Ya Yang, Andrew P. Mackenzie, Satoru Nakatsuji, Clifford W. Hicks. 2020-09-10. A new stress dilatometer and measurement of the thermal expansion under uniaxial stress of Mn$_3$Sn. https://doi.org/10.1063/5.0029198

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