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Title: Neutron diffraction study of MnNiGa{sub 2}—Structural and magnetic behaviour

MnNiGa{sub 2} crystallizes in the L21 (Heusler) structure and has a ferromagnetic ordering temperature T{sub C} ∼ 192 K. Rietveld refinement of the neutron diffraction patterns indicates that the Ga atoms occupy the equivalent 8c position, while Mn and Ni share the 4a (0, 0, 0) and 4b (0.5, 0.5, 0.5) sites with a mixed occupancy of Mn and Ni atoms. It is found that that ∼83% of Mn and ∼17% Ni are located at the 4a site while ∼83% of Ni and ∼17% Mn occupy the 4b site. There is no evidence of a magneto-volume effect around T{sub C}. In agreement with this finding, our detailed critical exponent analyses of isothermal magnetization curves and the related Arrott plots confirm that the magnetic phase transition at T{sub C} is second order.
Authors:
 [1] ;  [2] ;  [2] ; ;  [3] ;  [4] ; ;  [5] ;  [6] ; ;  [1] ;  [4] ;  [7]
  1. Institute for Superconductivity and Electronic Materials, University of Wollongong, Wollongong, NSW 2522 (Australia)
  2. (Australia)
  3. Institute of Physics, Chinese Academy of Science, Beijing 100190 (China)
  4. FRM-II, Technische Universität München, 85747 Garching (Germany)
  5. Bragg Institute, ANSTO, Lucas Heights, NSW 2234 (Australia)
  6. School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Canberra, ACT 2600 (Australia)
  7. (Germany)
Publication Date:
OSTI Identifier:
22273938
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 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; FERROMAGNETIC MATERIALS; FERROMAGNETISM; GALLIUM; INTERMETALLIC COMPOUNDS; MAGNETIZATION; MANGANESE; NEUTRON DIFFRACTION; NICKEL; PHASE TRANSFORMATIONS