Phase Separation in La_2 CuO_<4+δ> Single Crystals

概要

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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 how field. suggesting the magnetic-glass-like nature.
社団法人日本物理学会の論文
1995-09-15