Ultrasonic studies of the magnetic phase transition in MnSi

Abstract

Measurements of the sound velocities in a single crystal of MnSi were performed in the temperature range 4-150 K. Elastic constants, controlling propagation of longitudinal waves reveal significant softening at a temperature of about 29.6 K and small discontinuities at $\sim$28.8 K, which corresponds to the magnetic phase transition in MnSi. In contrast the shear elastic moduli do not show any softening at all, reacting only to the small volume deformation caused by the magneto-volume effect. The current ultrasonic study exposes an important fact that the magnetic phase transition in MnSi, occurring at 28.8 K, is just a minor feature of the global transformation marked by the rounded maxima or minima of heat capacity, thermal expansion coefficient, sound velocities and absorption, and the temperature derivative of resistivity.

arXiv comment4 pages, 4 figures

References in corpus (4)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• First order transitions and multicritical points in weak itinerant ferromagnets
• Theory of the helical spin crystal: a candidate for the partially ordered state of MnSi
• Blue Quantum Fog: Chiral Condensation in Quantum Helimagnets

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