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We present a method for measuring thermal expansion under tunable uniaxialstresses, and show measurements of the thermal expansion of Mn$_3$Sn, a roomtemperature antiferromagnet that exhibits a spontaneous Hall effect, underuniaxial stresses of up to 1.51 GPa compression. Measurement of thermalexpansion provides thermodynamic data about the nature of phase transitions,and uniaxial stress provides a powerful tuning method that does not introducedisorder. Mn$_3$Sn exhibits an anomaly in its thermal expansion near $\sim$270K, associated with a first-order change in its magnetic structure. We show thistransition 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.

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