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DyNi2Mn—magnetisation and M?ssbauer spectroscopy |
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| Authors: | Jian Li Wang Stewart James Campbell Shane Joseph Kennedy Shi Xue Dou Guang Heng Wu |
| Institution: | 1. School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Canberra, ACT, 2600, Australia 2. Bragg Institute, ANSTO, Lucas Heights, NSW, 2234, Australia 3. Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW, 2522, Australia 4. Institute of Physics, Chinese Academy of Science, Beijing, 100190, People’s Republic of China |
| Abstract: | The physical properties of DyNi2Mn doped with 57Fe have been investigated by X-ray diffraction, magnetisation (10–300?K) and 57Fe M?ssbauer spectroscopy measurements (5–300?K). DyNi2Mn(57Fe) crystallizes in the MgCu2-type cubic structure (Fd??3m space group). The ordering temperature is found to be TC?=?99(2) K, much higher than those of DyNi2 (～22?K) and DyMn2 (～35?K). Analyses of isothermal M–H curves and the related Arrott plots confirm that the magnetic phase transition at TC is second order. The magnetic entropy change around TC is 4.0?J/kg?K for a magnetic field change of 0?T to 5?T. The spectra above TC exhibit features consistent with quadrupolar effects while below TC the spectra exhibit magnetic hyperfine splitting. The Debye temperature for DyNi2Mn has been determined as θD?=?200(20) K from a fit to the variable temperature isomer shift IS(T). |
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