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Thermal Analysis on MnBi in High Magnetic Fields up to 45 T
Yoshifuru Mitsui,Yuki Ikehara,Kazuo Watanbe,Eun Sang Choi,Eric C. Palm,Keiichi Koyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Differential thermal analysis (DTA) equipment for utilization in a high magnetic field of 45 T wasdeveloped. From the DTA experiments, the decomposition temperature (MnBi ! Mn1.08Bi+liquid:632 K at zero field) Tt was found to increase linearly at a rate of 2 KT−1 in fields up to 18 T andto deviate from that linear increase above 20 T. In addition, the peritectic temperature (Mn1.08Bi! Mn + liquid: 721 K at zero field) Tm was slightly increased by applying a magnetic field. At amagnetic field of 45 T, Tt and Tm reached 714 K and 726 K, respectively. The behaviors of Tt andTm for MnBi and Mn1.08Bi under high magnetic fields are discussed, and the magnetic energies arecalculated on the basis of mean field theory.