Volume 122, Number 1, April 2018
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 May 2018|
Large magnetocaloric effect and critical behaviour analysis in Gd2Cu2In
1 Highly Correlated Matter Research Group, Department of Physics, University of Johannesburg P. O. Box 524, Auckland Park 2006, South Africa
2 Department of Condensed Matter Physics and Material Sciences, Tata Institute of Fundamental Research Colaba, Mumbai-400 005, India
3 Department of Physics, University of Texas at El Paso - 500 W University Ave, El Paso, TX 79968, USA
4 Max Planck Institute for Chemical Physics of Solids (MPICPfS) - Nöthnitzer Straße 40, 01187 Dresden, Germany
Received: 5 February 2018
Accepted: 9 May 2018
The ternary intermetallic compound Gd2Cu2In crystallizes in the Mo2Fe2B-type structure with the space group . The compound undergoes a ferromagnetic-paramagnetic (FM-PM) phase transition at 94.1 K and large magnetocaloric effect has been observed over a wide range of temperature. The isothermal magnetic entropy change and adiabatic temperature change were observed to be 13.8 J/kg · K and 6.5 K for 7 T 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 and are estimated through a non-linear fitting. The β value is close to the three-dimensional (3D) Ising value, whereas γ and δ 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 λ-type peak near 94 K indicating long-range magnetic ordering. The specific-heat exponent α was estimated by a non-linear fitting using the function . The fitting in the temperature range yields .
PACS: 75.30.Sg – Magnetocaloric effect, magnetic cooling / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.30.Cr – Saturation moments and magnetic susceptibilities
© EPLA, 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.