NDLI: Effects of the Cu Doping on Critical Behavior of <formula formulatype=inline><tex Notation=TeX>${rm La}_{0.7}{rm Ca}_{0.3}{rm MnO}

Content Provider	IEEE Xplore Digital Library
Author	Phan, T.L. Thanh, P.Q. Sinh, N.H. Zhang, Y.D. Yu, S.C.
Copyright Year	1965
Abstract	We have studied the influence of the Cu-doping on the critical properties of a polycrystalline sample of La_0.7Ca_0.3Mn_0.95Cu_0.05O₃ prepared by solid-state reaction. Analyses of static magnetization data in the vicinity of the ferromagnetic-paramagnetic phase transition based on the modified Arrott plot reveal critical parameters of T_C ≈ 197.3 K, β = 0.49 ± 0.03 and γ = 1.04 ± 0.04. These parameters are in good agreement with a magnetic equation of state M(H, ε) = ε^βf±(H/ε^β+γ), where ε = (T - T_C)/T_C (the reduced temperature), f₊ for T >; T_C and f_ for T <; T_C. Comparing with theoretical models, the critical exponents in our case are close to those expected for the mean-field theory. This reflects that the Cu doping leads to the second-order phase transition in La_0.7Ca_0.3Mn_0.95Cu_0.05O₃ while the parent compound of La_0.7Ca_0.3MnO exhibits the first-order phase transition. Such the phenomenon is assigned to changes in structural parameters, Mn³⁺/Mn⁴⁺ ratio, and magnetic interaction mechanisms caused by Cu dopants.
Sponsorship	IEEE Magnetics Society
Starting Page	1293
Ending Page	1296
Page Count	4
File Size	641099
File Format	PDF
ISSN	00189464
Volume Number	48
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ions Copper Doping Materials Mathematical model Magnetization Magnetic properties perovskite manganites Critical behavior magnetic phase transition
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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