Abstract
Phase separation in La 2 CuO 4+δ single crystals was studied with electrical resistivity, magnetic susceptibility, X-ray and neutron diffraction measurements. The c-axis resistivity of an as-grown crystal has dropped from 265 K down to 190 K and shown a hysteretic behavior between 270 K and 190 K. From X-ray results, these anomalies have been attributed to the progress of phase separation. The antiferromagnetic transition was observed in the midst of the phase separation at 250 K using neutron and magnetic susceptibility measurements. On the other hand, the Neel point in an oxygen-reduced crystal was found to be higher than its onset of phase separation. Based on these results, an approximate phase diagram has been made. Moreover, we observed susceptibility difference between zero field and field-cooled conditions only under a low field, suggesting the magnetic-glass-like nature.
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