Large magnetocaloric effect and critical behaviour analysis in Gd2Cu2In

Kumar, K. Ramesh; Nair, Harikrishnan S.; Sahu, B. N.; Xhakaza, Sindiwise; Strydom, André M.

doi:10.1209/0295-5075/122/17003

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Large magnetocaloric effect and critical behaviour analysis in Gd₂Cu₂In

MPS-Authors

/persons/resource/persons126866

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

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

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: https://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.