Jahn-Teller dynamics in charge-ordered manganites from Raman spectroscopy

被引：92

作者：

Dediu, V ^{[1
]}

Ferdeghini, C ^{[1
]}

Matacotta, FC ^{[1
]}

Nozar, P ^{[1
]}

Ruani, G ^{[1
]}

机构：

[1] CNR, Ist Spettroscopia Mol, I-40129 Bologna, Italy

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.84.4489

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Raman spectra of the charge-ordered manganite Pr0.65Ca0.35MnO3 were studied as functions of temperature and excitation energy and compared to magnetic moment and electrical conductivity behaviors. Both the charge ordering (T-co approximate to 225 K) and the antiferromagnetic transitions (T-N approximate to 175 K) affect the spectral shape and intensity, indicating strong charge-lattice and spin-lattice couplings. Below T-co a transition from dynamic Jahn-Teller distortions to a collective static distortion takes place. A change of the spectra is observed on increasing the excitation energy above 2.5 eV and it is attributed to a resonant polaron excitation.

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页码：4489 / 4492

页数：4

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