Critical analysis of the paramagnetic to ferromagnetic phase transition in Pr0.55K0.05Sr0.4MnO3

Rachid Thaljaoui , M. Pękała , J-F. Fagnard , Ph. Vanderbemden

Abstract

The 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.
Author Rachid Thaljaoui ZP - [University of Warsaw, Faculty of Chemistry]
Rachid Thaljaoui,,
- Semiconductors Division
- Uniwersytet Warszawski, Wydział Chemii
, M. Pękała
M. Pękała,,
-
, J-F. Fagnard
J-F. Fagnard,,
-
, Ph. Vanderbemden
Ph. Vanderbemden,,
-
Journal seriesPhysica B-Condensed Matter, ISSN 0921-4526
Issue year2016
Vol482
Pages8-13
Keywords in EnglishFerromagnetic 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
DOIDOI:10.1016/j.physb.2015.11.025
URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948845553&partnerID=40&md5=66a51341e3e456cae115a494e1a690d7
Languageen angielski
Score (nominal)20
ScoreMinisterial score = 20.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 20.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.386 (2) - 2016=1.352 (5)
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