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Magnetic and dielectric study of R(0.5)Sr(0.5)MnO(3) (R = Gd, Tb and Dy)

Author:
Yoshii, Kenji  Hiramitsu, Yusuke  Okajima, Yuka  Yoneda, Yasuhiro  Nishihata, Yasuo  Mizuki, Jun'ichiro  Nakamura, Akio  Shimojo, Yutaka  Ishii, Yoshinobu  Morii, Yukio  Ikeda, Naoshi  


Journal:
MATERIALS RESEARCH BULLETIN


Abstract(summary):

Magnetic and dielectric properties of perovskite manganites R(0.5)Sr(0.5)MnO(3)(R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at T(g) similar to 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R(3+) and Sr(3+) settled randomly at the same crystallographic site. Dielectric constants for each material were similar to 1000-10,000 between similar to 50 and similar to 300 K and showed broad maximums above T(g). Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this system are governed by the randomness at the R/Sr site. The tan delta and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons. (C) 2010 Elsevier Ltd. All rights reserved.


Page:
1574---1580


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