Observation of the charge order in perovskite manganite Pr0.5Ca0.5MnO3 by Mössbauer quadrupole effect

被引：0
作者：
Shin Nakamura
Akio Fuwa
Yorihiko Tsunoda
机构：
[1] Teikyo University,Department of Science and Engineering
[2] Waseda University,Advanced Research Institute of Science and Engineering
[3] Waseda University,Faculty of Science and Engineering
来源：
Hyperfine Interactions | 2012年 / 208卷
关键词：
Perovskite manganite; Pr; Ca; MnO; Charge order; Fe Mössbauer spectroscopy; Quadrupole effect;
D O I：
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中图分类号：
学科分类号：
摘要：
The charge order in a perovskite manganite Pr0.5Ca0.5MnO3 was investigated by Mössbauer spectroscopy. The quadrupole splitting and the absorption line width jump to an increase when lowering the temperature below 230 K (Tco), which is indicative of a phase transition to a monoclinic structure due to the charge ordering, or due to a local Jahn-Teller effect due to the presence of Mn3 +  ions. The intensity ratio of the doublet lines also changes at Tco. Local and dynamical Jahn-Teller effect (polarons) with a relaxation time of 10 − 8 s is present even in the metallic state.
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页码：29 / 32
页数：3
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