NDLI: Charge order and magnetoresistivity in a perovskite family of bismuth based manganites

Content Provider	IEEE Xplore Digital Library
Author	Krezhov, K.A.
Copyright Year	2007
Description	Author affiliation: Bulgarian Acad. of Sci., Sofia (Krezhov, K.A.)
Abstract	We exemplify some of the problems in designing novel functional materials with the substitution effects on colossal magnetoresistive (CMR) series $CaCu_{3}(Mn_{4-x}Fe_{x})O_{12}$ (x = 0, 0.5, 1.0) and on the charge order phenomenon in half hole-doped manganites $Bi_{0.25}RE_{0.25}Ca_{0.5}MnO_{3}$ (RE = La, Nd, Ho, Er, Tm) and $Bi_{0.5}Ca_{0.5}MnO_{3}$ (RE = La, Nd, Ho, Er, Tm) $Bi_{0.5}Ca_{0.5}MnO_{3}.$ All the $CaCu_{3}(Mn_{4-x}Fe_{x})O_{12}$ samples are ferromagnetic and show a progressive decrease of Tc, saturation magnetization and Weiss temperatures, as the Fe contents increases, which suggests an increment of the antiferromagnetic interactions at the (Mn,Fe) octahedral sublattice and to a considerable canting of the Fe vs Mn spins. The magnetoresistance also decreases upon Fe-doping. In contrast, the Bi-RE samples remain semiconducting by entering antiferromagnetic state at low temperature and similarly to end members $Bi_{0.5}Sr_{0.5}MnO_{3}$ and $Bi_{0.5}Ca_{0.5}MnO_{3}$ are remarkable for their particularly stable charge order of the $e_{g}$ electrons. Although giving rise to important modifications in the resulting magnetic properties and leading at rather low Fe substitution level to full suppression of charge order in $Bi_{0.5}Ca_{0.5}(Mn_{1-x}Fe_{x})O_{3}$ the Fe substitution does not induce magnetoresistive effect.
Starting Page	123
Ending Page	128
File Size	5546538
Page Count	6
File Format	PDF
ISBN	1424410568
DOI	10.1109/RAST.2007.4283963
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-14
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Neodymium Antiferromagnetic materials Bismuth Semiconductivity Iron Magnetic materials Colossal magnetoresistance Erbium Saturation magnetization
Content Type	Text
Resource Type	Article

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