Destruction of Neel order and appearance of superconductivity in electron-doped cuprates by oxygen annealing process
arXiv:0806.3426 · doi:10.1103/PhysRevB.78.014520
Abstract
We use thermodynamic and neutron scattering measurements to study the effect of oxygen annealing on the superconductivity and magnetism in PrLaCeCuO. Although the transition temperature measured by susceptibility and superconducting coherence length increase smoothly with gradual oxygen removal from the annealing process, bulk superconductivity, marked by a specific heat anomaly at and the presence of a neutron magnetic resonance, only appears abruptly when is close to the largest value. These results suggest that the effect of oxygen annealing must be first determined in order to establish a Ce-doping dependence of antiferromagnetism and superconductivity phase diagram for electron-doped copper oxides.
5 pages, 4 figures, accepted by Phys. Rev. B
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