Magnetic and transport properties in the Heusler series Ni2?xMn1+xSn affected by chemical disorder |
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| Affiliation: | 1. Max-Planck-Institute for Chemical Physics of Solids, 01187 Dresden, Germany;2. Helmholtz-Center Berlin for Materials and Energy, 14109 Berlin, Germany;1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str, 30-059, Kraków, Poland;2. AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, Mickiewicza 30, 30-059, Kraków, Poland;3. Department de Física, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, Palma de Mallorca, E-07122, Spain;1. Department of Physics, Shanghai University, Shanghai 200444, China;2. College of Physics and Electronic Engineering, Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education Institutes, Qujing Normal University, Qujing 655011, China;3. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China;4. Materials Genome Institute, Shanghai University, Shanghai 200444, China;5. Shanghai Key Laboratory of High Temperature Superconductors, Shanghai 200444, China;1. Instituto de Física, Universidade Federal do Rio de Janeiro, C.P. 68528, Rio de Janeiro, 21941-972, Brazil;2. Lab. Propiedades Térmicas Dieléctricas de Compositos, Depto. de Física y Química, Universidad Nacional de Colombia, A.A 127, Manizales, Colombia;3. Blackett Laboratory, Imperial College London, Prince Consort Rd., London, SW7 2BZ, United Kingdom;1. National Metallurgical Laboratory, Jamshedpur, 831007, India;2. Department of Metallurgy and Materials Engineering, IIEST, Shibpur, Howrah 711103, India;1. School of Materials Science and Engineering, Shanghai Jiao Tong University, 200240 Shanghai, PR China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, 200240 Shanghai, PR China |
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| Abstract: | Crystal structure, magnetic and transport characteristics of Ni2?x Mn1+x Sn Heusler series have been studied with the emphasis on chemical disorder effects. It is shown that the structure and the disorder character in these series can be predicted by using simple rules. Ni2 MnSn is a ferromagnetic, congruent melting phase, which crystallizes cubic in the L21 structure type. By increasing x, Ni and Mn atoms randomly mix and occupy the heterocubic sites of the regular Heusler structure, and the magnetic structure becomes ferrimagnetic. The total magnetic moment msat decreases linearly in the range 0.2 ≤ x ≤ 1, while the Curie temperature TC increases. At low Mn content (x < 0.2), the unit cell volume shows anomalous behavior, characterized by constant msat and TC. Electrical resistivity, Seebeck coefficient, and thermal conductivity strongly depend on the amount of disorder, which increases with the Mn content. Results of first-principle calculations based on the coherent potential approximation (CPA) alloy theory for the magnetic and electrical properties are in reasonable agreement with the simple rules and all experimental data. |
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| Keywords: | A Functional alloys (magnetic electrical biomedical) B Crystal chemistry B Magnetic properties E Electronic structure calculation E Physical properties |
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