期刊
PHYSICAL REVIEW B
卷 79, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.045121
关键词
charge density waves; lanthanum compounds; strontium compounds; X-ray scattering
资金
- Spanish CICyT [MAT2005-04562]
- Diputacion General de Aragon (DGA- CAMRADS)
We have investigated the threefold-charge ordering in La1/3Sr2/3FeO3 sample below T-CO similar to 200 K. We have measured superlattice reflections, q=a(*)(1/3 1/3 1/3), using the resonant x-ray scattering technique. The nonresonant intensities are consistent with a periodic structural modulation of both Fe and Sr(La)O-3 atomic planes. These displacements give rise to two nonequivalent Fe sites in the ratio of 2:1. Strong resonances are observed at the Fe K edge in the sigma-sigma(') geometry. These resonances did not exhibit azimuthal dependence. A charge disproportionation of 0.6 electrons is determined between the two Fe sites. Hence, the charge-ordered phase can be better understood as a charge-density-wave with a ...Fe3.3+Fe3.9+Fe3.9+... sequence along the cubic [111] direction.
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