Superconducting critical temperature, oxygen ordering and devil's staircase in YBa2Cu3O6+x

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Abstract

Using the appropriate extension of the three-band Hubbard model to describe the basal CuO2+x subsystem of YBa2Cu3O6+x, for a certain region of parameters we obtain: a) the number of holes nH in the superconducting planes and Tc as a function of x have a plateau, b) using a structural model to include the effect of interatomic OO repulsions, there is a transition from structures without first or second nearest-neighbor O atoms (HS) to order in chains (CS) at x ∼ 0.45 for increasing x. We also study the structural model for values of x for which the CS are stable.

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