A new stress dilatometer and measurement of the thermal expansion under uniaxial stress of MnSn
arXiv:2009.04890 · doi:10.1063/5.0029198
Abstract
We present a method for measuring thermal expansion under tunable uniaxial stresses, and show measurements of the thermal expansion of MnSn, 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. MnSn exhibits an anomaly in its thermal expansion near 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 0.1 J mol K and to vary only weakly with applied stress.
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