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Title: Structural transitions, magnetic properties, and electronic structures of Co(Fe)-doped MnNiSi compounds

The structural transitions, magnetic properties, and electronic structures of Co(Fe)-doped MnNiSi compounds are investigated by x-ray powder diffraction, differential scanning calorimetry (DSC), magnetic measurements, and first-principles calculations. Results indicate that all samples undergo a martensitic transition from the Ni{sub 2}In-type parent phase to TiNiSi-type orthorhombic phase at high temperatures. The substitution of Co(Fe) for Mn in Mn{sub 1−x}Co{sub x}NiSi (x = 0.2, 0.3, and 0.4) and Mn{sub 1−y}Fe{sub y}NiSi (y = 0.26, 0.30, 0.36, 0.46, and 0.55) samples decreases the structural transition temperature and Curie temperature of martensite. The martensite phases show a typical ferromagnetic behavior with saturation field being basically unchanged with increasing Co(Fe) content, while the saturation magnetization shows a decreasing tendency. The theoretically calculated moments are in good agreement with the experimentally measured results. The orbital hybridizations between different 3d elements are analyzed from the distribution of density of states.
Authors:
 [1] ;  [2] ; ; ; ; ;  [1] ;  [3]
  1. State Key Laboratory for Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  2. (China)
  3. School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130 (China)
Publication Date:
OSTI Identifier:
22410006
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALORIMETRY; COBALT COMPOUNDS; CONCENTRATION RATIO; CURIE POINT; DENSITY OF STATES; DOPED MATERIALS; ELECTRONIC STRUCTURE; IRON COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANESE COMPOUNDS; MARTENSITE; NICKEL SILICIDES; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; X-RAY DIFFRACTION