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  Structural, transport, magnetic, magnetocaloric properties and critical analysis of Ni-Co-Mn-Ga Heusler alloys

Arumugam, S., Devarajan, U., Muthu, S. E., Singh, S., Thiyagarajan, R., Raja, M. M., et al. (2017). Structural, transport, magnetic, magnetocaloric properties and critical analysis of Ni-Co-Mn-Ga Heusler alloys. Journal of Magnetism and Magnetic Materials, 442, 460-467. doi:10.1016/j.jmmm.2017.07.016.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-05D0-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-05D2-5
Genre: Journal Article

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 Creators:
Arumugam, S.1, Author
Devarajan, U.1, Author
Muthu, S. Esakki1, Author
Singh, Sanjay2, Author              
Thiyagarajan, R.1, Author
Raja, M. Manivel1, Author
Rao, N. V. Rama1, Author
Banerjee, Alok1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              

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 Abstract: In this work, we have investigated structural, transport, magnetic, magnetocaloric (MC) properties and critical exponents analysis of the (Ni2.1-xCox)Mn-0.9 Ga (x = 0, 0.04, 0.12 and 0.2) Heusler alloys. For all compositions, cubic austenite (A) phase with metallic character is observed at room temperature (RT). With increasing of Co content, magnitude of resistivity decreases, whereas residual resistivity (rho(0)) and electron scattering factor (A) increases linearly. Magnetic measurements exhibit that ferromagnetic (FM) Curie temperature (T-C(A)) increases towards RT by increasing Co concentration. All samples show conventional MC and maximum magnetic entropy change (Delta S-M(peak)) of -2.8 Jkg(-1) K-1 is observed for x = 0.12 at 147 K under 5 T. Further, hysteresis is observed between cooling and warming cycles around FM-PM (T-C(A)) transition in x = 0, 0.04 samples, which suggests that first order nature of transition. However, there is no hysteresis across T-C(A) for x = 0.12 and 0.2 samples suggesting second-order nature of the transition. The critical exponents are calculated for x = 0.12 sample around T-C(A) using Arrott plot and Kouvel-Fisher method, the estimated critical exponents are found closer to the mean-field model reveals the long range ferromagnetic ordering in this composition. (C) 2017 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2017-07-082017-07-08
 Publication Status: Published in print
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Title: Journal of Magnetism and Magnetic Materials
  Other : Journal of Magnetism and Magnetic Materials: MMM
  Abbreviation : J. Magn. Magn. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : NH, Elsevier
Pages: - Volume / Issue: 442 Sequence Number: - Start / End Page: 460 - 467 Identifier: ISSN: 0304-8853
CoNE: /journals/resource/954925512464