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Magnetic and Dielectric Properties of R(0.5)Ca(0.5)MnO(3) (R = Eu-Lu)

Author:
Yoshii, Kenji  Hiramitsu, Yusuke  Yoneda, Yasuhiro  Okajima, Yuka  Nishihata, Yasuo  Mizuki, Jun'Ichiro  Ikeda, Naoshi  


Journal:
FERROELECTRICS


Abstract(summary):

The magnetic and dielectric properties of perovskite manganites R(0.5)Ca(0.5)MnO(3) (R = Eu-Lu), which show charge ordering of the Mn-3d electrons below room temperature, have been investigated. Their dielectric constants were similar to 1000-10000 at around room temperature. Inflections or peaks of temperature dependences of the dielectric constants were observed at around the charge-ordering temperatures. Analyses of tan delta for R = Eu-Lu and EXAFS spectra for R = Dy suggested that the dielectric properties of the present system are rooted in a special arrangement and transfer of the Mn-3d electrons. The two-peak structure of tan d indicates that dielectric measurement can be used to observe homogeneity or inhomogeneity of sample, as mentioned in our previous paper on the ruthenium perovskite oxides.


Page:
407---414


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