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Magnetic Phase Transition and Elastic Properties of α-Mn at Low Temperature

Elastic and anelastic properties of polycryatalline α-Mn at low temperature have been studied using electromagnetic acoustic resonance (EMAR) and resonance ultrasound spectroscopy coupled with a laser Doppler interferometer (RUS/Laser). α-Mn showed low Poisson's ratio both in the paramagnetic state at 290 K and in the anti-ferromagnetic state at 4 K. The acoustic Debye temperature was 479 K, showing good consistency with the previous work. Around the magnetic transition temperature (TN=98 K), remarkable changes in Poisson's ratio and internal friction are identified, indicating strong magnetic acoustic interaction at the transition temperature.