Critical analysis of the paramagnetic to ferromagnetic phase transition in Pr0.55K0.05Sr0.4MnO3
Rachid Thaljaoui , M. Pękała , J-F. Fagnard , Ph. Vanderbemden
AbstractThe critical properties of monovalent doped manganite Pr0.55K0.05Sr0.4MnO3 around the paramagnetic to ferromagnetic phase transition were investigated through various methods: the modified Arrott plots (MAP), the Kouvel-Fisher method and the critical isotherm analysis. Data obtained near Tc were examined in the framework of the mean field theory, the 3D-Heisenberg model, the 3D-Ising model, and tricritical mean field. The deduced critical exponents values obtained using MAP method were found to be β=0.44(4) with TC≈303 K and γ=1.04(1) with TC≈302 K. Kouvel-Fisher method supplies the critical values to be β=0.41(2) with TC≈302 K and γ=1.09(1) with TC≈302 K. The obtained critical parameters show a tendency towards the mean-field behavior, suggesting the existence of long-range ferromagnetic order in the compound studied. The exponent δ deduced separately from isotherm analysis at T=303 K was found to obey to the Widom scaling relation δ=1+γ/β. The reliability of obtained exponents was confirmed by using the universal scaling hypothesis. The itinerant character of ferromagnetism in the present system was also tested by using Rhodes-Wohlfarth's criterion. © 2015 Elsevier B.V.
|Journal series||Physica B-Condensed Matter, ISSN 0921-4526|
|Keywords in English||Ferromagnetic materials; Ising model; Isotherms; Manganese oxide; Manganites; Mean field theory; Paramagnetism; Phase transitions, Critical analysis; Critical isotherms; Critical properties; Ferromagnetic Phase Transition; Long range ferromagnetic order; Mean-field behavior; Modified arrott plots; Rhodes-Wohlfarth's criterion, Ferromagnetism|
|Score|| = 20.0, 28-11-2017, ArticleFromJournal|
= 20.0, 28-11-2017, ArticleFromJournal
|Publication indicators||: 2016 = 1.386 (2) - 2016=1.352 (5)|
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