Valence changes and structural distortions in "Charge Ordered" manganites quantified by atomic-scale scanning transmission electron microscopy

被引：19

作者：

Loudon, J. C.

Kourkoutis, L. Fitting

Ahn, J. S.

Zhang, C. L.

Cheong, S. -W.

Muller, D. A.

机构：

[1] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA

[2] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.99.237205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the microscopic nature of the "charge ordering" modulation in mixed-valent manganites in real space using scanning transmission electron microscopy. The modulation in Bi(0.5)Sr(0.4)Ca(0.1)MnO(3) has a uniform periodicity appearing as stripes in high angle annular dark field images. Geometric phase analysis shows the modulation to be a displacement wave with transverse amplitude (0.008 +/- 0.001)a and longitudinal amplitude (0.003 +/- 0.001)a. Series of energy loss spectra taken across the stripes show no periodic changes and place an upper bound of +/- 0.04 on any valence changes of the Mn ions.

引用

页数：4

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