TY - JOUR

T1 - Study of critical exponents in doped La2/3Ca1/3Mn1-yFeyO3(y = 0, 0.03) manganite films

AU - Arnache, O.

AU - Campillo, G.

AU - Hoffmann, A.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - © 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.

AB - © 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.

U2 - 10.1007/s00339-014-8477-1

DO - 10.1007/s00339-014-8477-1

M3 - Article

SN - 0947-8396

SP - 937

EP - 943

JO - Applied Physics A: Materials Science and Processing

JF - Applied Physics A: Materials Science and Processing

ER -