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Large magnetocaloric effect and critical behaviour analysis in Gd2Cu2In

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Strydom,  André M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0001-7B7B-C
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.