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

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4863255· OSTI ID:22273872

Wu, R. R.; Bao, L. F.; Wang, J.; Zheng, X. Q.; Liu, Y.; Sun, J. R.; Shen, B. G. ^[1]

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1. Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

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.

• OSTI ID: 22273872
• Journal Information: Journal of Applied Physics, Vol. 115, 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); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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