Low temperature heat capacity and magnetic study of the Al80Mn20 icosahedral alloy |
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| Institution: | 1. GEOTOP and Department of Earth and Planetary Sciences, McGill University, Montreal, QC H3A 0E8, Canada;2. Faculty of Economics, Okinawa International University, Okinawa 901-2701, Japan;1. Jiangsu Provincial Key Laboratory for Interventional Medical Devices, Huaiyin Institute of Technology, 1 Meicheng Street, Huaian 223003, PR China;2. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, PR China;3. Faculty of Mechanical and Meterial Engineering, Huaiyin Institute of Technology, 1 Meicheng Street, Huaian 223003, PR China |
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| Abstract: | Low temperature heat capacity and magnetization measurements are reported for the Al80Mn20 alloy in the quasicrystalline icosahedral phase. The heat capacity, which was measured for temperatures ranging from 0.5 to 5.0 K and magnetic fields up to 11.7 kOe, shows a broad magnetic contribution around 1.0 K. The linear electronic contribution does not indicate an anomalously high density-of-states at the Fermi energy as predicted theoretically for quasicrystalline systems. The d.c. magnetization, which was measured from 2.0 to 300 K and with magnetic fields up to 50 kOe, indicates an effective number of one 11 μB localized magnetic moment for approximately every 100 Mn atoms. The low field susceptibility follows the Curie-Weiss law for temperatures ≧ 10 K, while a spin-glass-like ordering is observed at low temperatures. |
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