Revisiting La_0.5Sr_1.5MnO₄ lattice distortion and charge ordering with multi-beam resonant diffraction

详细信息    查看全文

• 作者：Wen-Chung Liu ; Yi-Hua Chiu ; Ying-Yu Kung ; Po-Yu Liao ; Chih-Hao Cheng ; Yu-Chieh Chih ; Yi-Wei Tsai ; Chia-Hung Chu ; Chia-Hung Lai ; Di-Jing Huang ; Yun-Liang Soo and Shih-Lin Chang
• 关键词：X-ray multiple diffraction ; dynamical X-ray diffraction theory ; La0.5Sr1.5MnO4
• 刊名：Acta Crystallographica Section A
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：73
• 期：1
• 页码：46-53
• 全文大小：1279K
• ISSN：1600-5724

文摘

Sinusoidal wave type distortions of La_0.5Sr_1.5MnO₄ in the low-temperature orthorhombic phase were observed using multi-beam resonant X-ray diffraction (MRXD) with (7/4 7/4 0) fractional primary diffraction. Two four-beam diffractions with opposite asymmetry were measured at 6.5545 keV and compared with the curves simulated by the dynamical X-ray diffraction theory. This approach provides the possibility of resolving the distortion modes which are perpendicular to the momentum transfer by a single azimuthal scan. The paper also demonstrates the sensitivity of MRXD profiles versus incident X-ray energy in the vicinity of the Mn K edge to the charge disproportion between the two manganese sites, reconfirming the small charge disproportion feature.