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Title: Inverse magnetocaloric effect in Mn{sub 2}NiGa and Mn{sub 1.75}Ni{sub 1.25}Ga magnetic shape memory alloys

Inverse magnetocaloric effect is demonstrated in Mn{sub 2}NiGa and Mn{sub 1.75}Ni{sub 1.25}Ga magnetic shape memory alloys. The entropy change at the martensite transition is larger in Mn{sub 1.75}Ni{sub 1.25}Ga, and it increases linearly with magnetic field in both the specimens. Existence of inverse magnetocaloric effect is consistent with the observation that magnetization in the martensite phase is smaller than the austenite phase. Although the Mn content is smaller in Mn{sub 1.75}Ni{sub 1.25}Ga, from neutron diffraction, we show that the origin of inverse magnetocaloric effect is the antiferromagnetic interaction between the Mn atoms occupying inequivalent sites.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001 (India)
  2. Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli 620024 (India)
  3. Forschungsneutronenquelle Heinz Maier-Leibnitz FRM-II, Technische Universität München, Lichtenbergstrasse 1, 85747 Garching b. München (Germany)
  4. European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38000 Grenoble (France)
  5. Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France)
Publication Date:
OSTI Identifier:
22283300
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 5; 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; ANTIFERROMAGNETISM; ATOMS; AUSTENITE; ENTROPY; GALLIUM ALLOYS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANESE ALLOYS; MARTENSITE; NEUTRON DIFFRACTION; NICKEL ALLOYS; SHAPE MEMORY EFFECT