Superstructures in superconductors: The case of YBCO (original) (raw)

Aps Meeting Abstracts, 2005

Abstract

Superstructures characterized by q=(qx, 0, 0) are observed throughout the phase diagram of yttrium-barium cuprates (YBa2Cu3O6+x, YBCO); q decreases with doping from 12 (2-unit-cell) in the heavily un-derdoped compound to 15 in the overdoped material. A 4-unit-cell superstucture is stable in the vicinity of optimal doping. The superstructures in YBCO correspond to short-range ordered regions of coupled atomic displacements on neighboring CuO, BaO, and CuO2 planes, respectively. T-dependent measurements suggest that these ``nanodomains'' experience anharmonic thermal motion. These regions induce a long-range strain in the host, which manifests as ``bow-tie''-shape Huang diffuse scattering below ˜200 K. X- ray diffuse scattering results will be presented within the context of the oxygen ordering and the phase diagram.

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