Analysis of the x-ray resonant scattering at the Mn K edge in half-doped mixed valence manganites

被引:66
作者
García, J [1 ]
Sánchez, MC [1 ]
Blasco, J [1 ]
Subías, G [1 ]
Proietti, MG [1 ]
机构
[1] Univ Zaragoza, CSIC, Dept Fis Mat Condensada, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
关键词
D O I
10.1088/0953-8984/13/14/302
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
We reconsider the interpretation of x-ray resonant scattering experiments performed on the so-called charge-ordered manganites with Mn3+/Mn4+ = 1. The comparison between these experiments and our,x-ray absorption data shows that no real Mn3+/Mn4+ charge ordering occurs in these compounds. However, these experiments demonstrate the presence of two different types of manganese atom with a different local geometrical structure. We propose a structural model which accounts for these resonant scattering experiments. Within this model, the charge-ordering phase transition can be explained as a structural phase transition driven by the softening of a phonon mode. This produces a periodic arrangement of local distortions, which is responsible for the observed resonances. Furthermore, electronic localization in these materials would occur on a length scale larger than the atomic one.
引用
收藏
页码:3243 / 3256
页数:14
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