Oxygen superstructures throughout the phase diagram of $\bf (Y,Ca)Ba_2 Cu_3 O_{6+x}$

Details Oxygen superstructures throughout the phase diagram of $\bf (Y,Ca)Ba_2 Cu_3 O_{6+x}$ Oxygen superstructures throughout the phase diagram of $\bf (Y,Ca)Ba_2 Cu_3 O_{6+x}$

2003-11-25

arxiv.org/abs/cond-mat/0311570v2

Phys. Rev. Lett. 93, 157007 (2004)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.93.157007

Short-range lattice superstructures have been studied with high-energy x-ray diffuse scattering in underdoped, optimally doped, and overdoped $\rm (Y,Ca)Ba_2 Cu_3 O_{6+x}$. A new four-unit-cell superstructure was observed in compounds with $x\sim 0.95$. Its temperature, doping, and material dependence was used to attribute its origin to short-range oxygen vacancy ordering, rather than electronic instabilities in the $\rm CuO_2$ layers. No significant diffuse scattering is observed in YBa$_2$Cu$_4$O$_{8}$. The oxygen superstructures must be taken into account when interpreting spectral anomalies in $\rm (Y,Ca)Ba_2 Cu_3 O_{6+x}$.

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