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VOLUME 58 | ISSUE 2 | PAGE 143
Could the oxygen superstructure in YBa2Cu3O6.35 exist?
In order to explain why the real superstructure in the basal plane of ¥2306_|_ at x~0.35 can exist and be observed experimentally, it is necessary to invoke simple electrostatic and charge transfer mechanisms. The numerical estimates support the assumption that the superstructure [proposed by D. Hohlwein et al., Phys. Rev. Lett. 66, 1497 (1991); Z. Phys. B86, 11 (1992)], which is formed by very short Cu-O-Cu chain fragments, can co-exist with the tetragonal phase which consists of short fragments arranged spatially at random.




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