Temperature dependence of atomic modulation in the incommensurate composite crystal structure of (Sr2Cu2O3)0.70CuO2, ‘Sr14Cu24O41’

✍ Scribed by Y. Gotoh; I. Yamaguchi; H. Eisaki; T. Nagata; J. Akimitsu

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 195 KB
• Volume: 445-448
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.03.089

✦ Synopsis

Temperature dependence of atomic modulation in the incommensurate composite crystal structure of (Sr 2 Cu 2 O 3 ) 0.70 CuO 2 , 'Sr 14 Cu 24 O 41 ' with two-legged Cu 2 O 3 ladder and edge-shared CuO 2 chain has been investigated by single-crystal X-ray diffraction method using centrosymmetric (3 + 1)-dimensional superspace group. The displacive modulations of all constituent atoms at 150 K have been compared with those obtained at room temperature. The hole distribution between the Cu 2 O 3 ladder plane and the one-dimensional CuO 2 chain has been considered on the basis of the changes of lattice constants of incommensurate basic structure, the role of the atomic modulation and the interatomic distances between Cu atom in the Cu 2 O 3 and O atom in the CuO 2 . It is indicated that the small amount of holes doped in the Cu 2 O 3 ladder have been back-transferred to the CuO 2 chain and that almost all of the holes in (Sr 2 Cu 2 O 3 ) 0.70 CuO 2 are localized in the CuO 2 at low temperature.