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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 Mn3Sn, a room temperature antiferromagnet that exhibits a spontaneous Hall effect, under uniaxial stresses of up to 1.51GPa compression. The 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. Mn3Sn exhibits an anomaly in its thermal expansion near similar to 270K, associated with a first-order change in its magnetic structure. We show that this transition temperature is suppressed by 54.6K by 1.51GPa compression along [0001]. We find the associated entropy change at the transition to be similar to 0.1J mol(-1) K-1 and to vary only weakly with applied stress.
