Abstract
Abstract A series of samples with bulk compositions Nd 2-χ Ce χ CuO 4 , 0≤χ≤0.25, have been examined by pulsed neutron and high-resolution synchrotron X-ray diffraction. The diffraction data show that single phase material is formed only for the undoped compound, Nd 2 CuO 4 , and (possibly) for the optimum superconducting composition, χ≈0.165. Other samples appear to be a mixture of this superconducting composition and non-superconducting material of other compositions. The phase separation cannot be explained in the context of an equilibrium phase diagram and, thus, must result from non-equilibrium behavior during synthesis.
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