Study of critical exponents in doped La<inf>2/3</inf>Ca<inf>1/3</inf>Mn<inf>1-y</inf>Fe<inf>y</inf>O<inf>3</inf>(y = 0, 0.03) manganite films

O. Arnache, G. Campillo, A. Hoffmann

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Abstract

© 2014, Springer-Verlag Berlin Heidelberg. In this work, we investigated close to the Curie temperature TCthe critical exponents of the magnetization of doped manganite La2/3Ca1/3Mn0.97Fe0.03O3(LCMFO) thin films, as well as undoped La2/3Ca1/3MnO3(LCMO). Using a TCdistribution given by the intrinsic magnetic inhomogeneities in these ferromagnets enables the determination of β and δ critical exponents [corresponding to M(T) and M(H) respectively], average Curie temperature < TC > , and the TCdistribution width, ΔTC. Additionally, we extracted the critical exponent η = βδ from the fits of ΔTCas a function of the external applied magnetic field. We found a value of 1.74 ± 0.09 for this exponent, close to that reported in undoped La2/3Ca1/3MnO3thin films. Even though the substitution effects of the Mn ions by Fe affect the magnetotransport and structural properties of LCMO system, these results suggest that around TC, the magnetic phase transition, governed by the critical exponents, is similar in both magnetic systems, and belongs to the same universality class.
Original languageAmerican English
Pages (from-to)937-943
Number of pages7
JournalApplied Physics A: Materials Science and Processing
DOIs
StatePublished - 1 Jan 2014

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