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Title: Effect of substitution of In for Co on magnetostructural coupling and magnetocaloric effect in MnCo{sub 1-x}In{sub x}Ge compounds

Effect of replacement of Co by In with larger atomic radius but fewer valence numbers on magnetostructural coupling and magnetocaloric effect is studied in MnCo{sub 1-x}In{sub x}Ge compounds. The substitution of Co by a small amount of In (1.5%–2%) can shift martensitic transformation T{sub stru} to lower temperature and make it overlap with Curie temperature T{sub C}. As a result, magnetostructural coupling is created and large entropy change (ΔS) takes place. Further increasing In content to x = 0.03 leads to decoupling, but the martensitic transition (T{sub stru} ∼ 249 K) is still close to the magnetic transition (T{sub c}{sup A} ∼ 269 K). As a result, two close ΔS peaks appear. Mechanism related to different large entropy change in the coupled and decoupled samples are discussed.
Authors:
; ; ; ; ; ; ;  [1]
  1. Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
Publication Date:
OSTI Identifier:
22273872
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; COBALT COMPOUNDS; COUPLING; CURIE POINT; DECOUPLING; ENTROPY; GERMANIDES; INDIUM COMPOUNDS; MAGNETIC PROPERTIES; MANGANESE COMPOUNDS; PHASE TRANSFORMATIONS; TEMPERATURE DEPENDENCE; VALENCE