Local structural distortions inducing resonant forbidden reflections in LaMnO3

被引:0
作者
Subias, G. [1 ]
Herrero-Martin, J. [1 ]
Garcia, J. [1 ]
Blasco, J. [1 ]
Sanchez, M. C. [1 ]
Mazzoli, C. [2 ]
Di Matteo, S. [3 ]
Hatada, K. [1 ,3 ]
Natoli, C. R. [3 ]
机构
[1] Univ Zaragoza, ICMA, CSIC, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[3] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
来源
X-RAY ABSORPTION FINE STRUCTURE-XAFS13 | 2007年 / 882卷
关键词
X-ray resonant scattering; orbital ordering; manganites;
D O I
暂无
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We have performed a complete resonant x-ray scattering (RXS) study at the Mn K-edge of LaMnO3. (h 0 0), (0 k 0) and (0 0 1) reflections with 1-4 k and 1=odd, were measured between 10 and 300 K. We observed strong resonant peaks at the three types of reflections. They exhibit dipolar character with a change of the light polarization plane from 0 to pi. The azimuth angular dependence of all these reflections showed a characteristic sine evolution of pi-period. The energy dependence of the scattered intensity for (h 0 0) and (0 k 0) reflections was identical while different structures were observed for the (0 0 1) reflections. We did not observe any change either on the resonance intensity or on the shape when crossing the Neel temperature T-N similar to 140 K. All resonances seem to be decoupled from the magnetic ordering and this is true even for (0 0 1) reflections, which correspond to the magnetic ordering direction. The tensor analysis indicates that the azimuth behavior of these reflections is reproduced by considering the crystallographic octahedral tilts.
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页码:544 / +
页数:2
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