Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624429 | Ceramics International | 2016 | 30 Pages |
Abstract
The aim of our study was to investigate the critical exponents of Nd0.7Sr0.1Ba0.1Ca0.1MnO3âδ material around its paramagnetic to ferromagnetic phase transition. Reliable critical exponents i.e. β=0.355, γ=1.329, and δ=4.867 at the critical temperature TC=117 K were refined using modified Arrott plot and Kouvel-Fisher methods. The critical exponent δ=4.760±0.129 was further separately determined from the isothermal magnetization data. Finally these critical exponents fulfill the Widom scaling relation δ=1+γ/β. Based on these analysis, the magnetization-field-temperature (M-H-T) data around TC collapses into two independent curves obeying the single scaling equation M(H,ε)=|ε|βf±(H/|ε|β+γ), with ε=(TâTC)/TC is the reduced temperature. Once again, the critical exponents are confirmed by the field dependence of the magnetic entropy change relation âSM|T=TC âHn with n=1+(βâ1)/(β+1). The obtained critical exponents for Nd0.7Sr0.1Ba0.1Ca0.1MnO3âδ manganite are in accordance with the prediction of the 3D-Heisenberg model with short-range magnetic interactions. The temperature dependence of specific heat and magnetic entropy change ÎSM further supports second order PM-FM phase transition and shed light the A-site-disordered perovskite effect on the magnetocaloric properties.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
N. Mtiraoui, M. Chennabasappa, R. Decourt, O. Toulemonde, J. Dhahri, M. Oumezine,