One Dimensional Oxygen Ordering in YBa2Cu3O(7-delta)

Details One Dimensional Oxygen Ordering in YBa2Cu3O(7-delta) One Dimensional Oxygen Ordering in YBa2Cu3O(7-delta)

1993-05-04

arxiv.org/abs/cond-mat/9305002v1

Physics

Condensed Matter

13 pages,Revtex,3 figures available upon request but can be plotted using simple analytical functions,CNEA-CAB 92/042

Scientific paper

10.1103/PhysRevB.47.15308

A model consisting of oxygen-occupied and -vacant chains is considered, with repulsive first and second nearest-neighbor interactions V1 and V2, respectively. The statistical mechanics and the diffraction spectrum of the model is solved exactly and analytically with the only assumption V1 >> V2. At temperatures T ~ V1 only a broad maximum at (1/2,0,0) is present, while for ABS(delta - 1/2) > 1/14 at low enough T, the peak splits into two. The simple expression for the diffraction intensity obtained for T << V1 represents in a more compact form previous results of Khachaturyan and Morris[1],extends them to all delta and T/V2 and leads to a good agreement with experiment. [1] A.G.Khachaturyan and J.W.Morris, Jr., Phys.Rev.Lett. 64,76(1990)

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