2017/11/27 by R. Kumar, Harikrishnan S. Nair, Kumar, Ramesh K. +7
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #High-pressure geophysics and materials #Materials Science (cond-mat.mtrl-sci) #Statistical Mechanics and Entropy #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.1711.09816
openalex publication_date 2017/11/27 · openalex created_date 2017/12/04 · openalex updated_date 2026/07/28
The ternary intermetallic compound Gd2Cu2In crystallizes in Mo2Fe2B type structure with the space group P4/mbm and we study critical behaviour and magnetocaloric effect near the ferromagnetic transition (TC ≈ 94 K) using the magnetic and heat capacity measurements. The maximum entropy change (ΔSm) and adiabatic temperature change (ΔTad) for the field value of 7 T were observed to be 13.8 J/kg.K and 6.5 K respectively. We have employed modified Arrott plot (MAP), Kouvel-Fisher (KF) procedures to estimate the critical exponents near the FM-PM phase transition. Critical exponents β = 0.312(2), γ = 1.080(5) are self-consistently estimated from the non-linear fitting. The β value is close to the three dimensional (3D) Ising model where as γ and δ values are close to mean field model. The estimated critical exponents for Gd2Cu2In suggest that the system may belong to different universal class. All the three critical exponent obey Widom scale and collapse the scaled magnetic isotherms into two distinct branches below and above TC in accordance with single scaling equation. Specific heat measurements show a λ type peak near 94 K confirming the bulk magnetic ordering. The data near TC was fitted using the non-linear function CP = B + Cε+ A±|ε|-α(1 + E± |ε|0.5) between -0.025