NDLI: Influence of a-site substitution on the EPR parameters of La/sub 0.7/A'/sub 0.3/MnO/sub 3/ (A'= Sr, Ba) compounds

Content Provider	IEEE Xplore Digital Library
Author	Van Khiem, N. Zidanic, J. Nguyen Xuan Phuc Seong-Cho Yu
Copyright Year	1965
Abstract	In this paper, we investigate in detail influences of A-site substitution on the EPR parameters for La/sub 0.7/Sr/sub 0.3/MnO/sub 3/ (LSM) and La/sub 0.7/Ba/sub 0.3/MnO/sub 3/ (LBM) compounds by means of electron paramagnetic resonance (EPR) study. Magnetization and resistivity measurements were also performed. The Curie temperature T/sub C/ is 365 and 322 K for LSM and LBM, respectively. In the whole temperature range studied, metallic behavior was observed. The minimum linewidth /spl Delta/H/sub min/ is 402 and 378 Oe for LSM and LBM, respectively. Temperature dependences of the EPR linewidth /spl Delta/H/sub pp/(T) for the samples were analyzed by using the model of adiabatic hopping motion of small polarons, /spl Delta/H/sub pp/(T)=/spl Delta/H/sub 0/+(A/T)exp(-E/sub a//k/sub B/T). The activation energies E/sub a//sup (1)/ and E/sub a//sup (2)/, obtained from /spl Delta/H/sub pp/(T) and EPR intensity I(T) data, are different. At temperatures T>T/sub min/, the Lande factor of both samples is the same (g/spl ap/2), indicating that spin-spin interactions among electrons of Mn/sup 3+/ and Mn/sup 4+/ ions play a main role.
Sponsorship	IEEE Magnetics Society
Starting Page	2769
Ending Page	2771
Page Count	3
File Size	159760
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Paramagnetic resonance Strontium Electrons Temperature dependence Colossal magnetoresistance Magnetization Temperature distribution Magnetic field measurement Materials science and technology Nuclear magnetic resonance manganites perovskites electron paramagnetic resonance (EPR)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Influence of a-site substitution on the EPR parameters of La/sub 0.7/A'/sub 0.3/MnO/sub 3/ (A'= Sr, Ba) compounds

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