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

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.

References in corpus (2)

• Electrical Manipulation of a Topological Antiferromagnetic State
• A uniaxial stress capacitive dilatometer for high-resolution thermal expansion and magnetostriction under multiextreme conditions

Cited by in corpus (2)

• Observation of an Anomalous Hall Effect in Single-crystal Mn3Pt
• Giant lattice softening at a Lifshitz transition in Sr${}_2$RuO${}_4$