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  Large magnetocaloric effect and critical behaviour analysis in Gd2Cu2In

Kumar, K. R., Nair, H. S., Sahu, B. N., Xhakaza, S., & Strydom, A. M. (2018). Large magnetocaloric effect and critical behaviour analysis in Gd2Cu2In. EPL, 122(1): 17003, pp. 1-7. doi:10.1209/0295-5075/122/17003.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7B7B-C Version Permalink: http://hdl.handle.net/21.11116/0000-0001-7B7D-A
Genre: Journal Article

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Kumar, K. Ramesh1, Author
Nair, Harikrishnan S.1, Author
Sahu, B. N.1, Author
Xhakaza, Sindiwise1, Author
Strydom, André M.2, Author              
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1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: The ternary intermetallic compound Gd2Cu2In crystallizes in the Mo2Fe2B-type structure with the space group P4/mbm. The compound undergoes a ferromagnetic-paramagnetic (FM-PM) phase transition at 94.1K and large magnetocaloric effect has been observed over a wide range of temperature. The isothermal magnetic entropy change (Delta Sm) and adiabatic temperature change (Delta T-ad) were observed to be 13.8 J/kg.K and 6.5K for 7T applied field. We have employed a modified Arrott plot (MAP) and Kouvel-Fisher (KF) procedures to estimate the critical exponents near the FM-PM phase transition. Critical exponents beta = 0.312(2) and gamma = 1.080(5) are estimated through a non-linear fitting. The beta value is close to the three-dimensional (3D) Ising value, whereas gamma and delta values lie closer to the mean-field values. Scaled magnetic isotherms collapse into two branches below and above TC in accordance with a single scaling equation. Specific-heat measurements show a lambda-type peak near 94K indicating long-range magnetic ordering. The specific-heat exponent a was estimated by a non-linear fitting using the function C-P = B + Cc + A(+/-)|c|(-alpha) (1 + E-+/-|c|(0.5)). The fitting in the temperature range -0.025 < c < 0.025 yields alpha = 0.11(3). Copyright (C) EPLA, 2018.

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Language(s): eng - English
 Dates: 2018-05-292018-05-29
 Publication Status: Published in print
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Title: EPL
  Other : EPL: A Letters Journal Exploring the Frontiers of Physics
Source Genre: Journal
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Publ. Info: Les-Ulis : EDP Science
Pages: - Volume / Issue: 122 (1) Sequence Number: 17003 Start / End Page: 1 - 7 Identifier: Other: 0295-5075
CoNE: /journals/resource/0295-5075