Abstract
We have made samples of La1.85Ba0.15CuO4−y with varying heat treatments. We have measured their dc magnetization and electron paramagnetic resonance, and have examined them by electron microscopy and electron diffraction. For samples annealed only a few hours, cooling the material below 5 K causes a magnetic transition and a thermal hysteresis. These observations, taken with the EPR data, suggest a possible spin-glass or ferromagnetic phase. Annealing samples in an oxygen atmosphere appears to remove that magnetic phase. For the phase with the K2NiF4 structure, no superlattice spots are seen in electron diffraction at room temperature or at 77 K.
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Friedmann, T.A., Reeves, M.E., Ginsberg, D.M. et al. Detection of a metastable magnetic phase in the La1.85Ba0.15CuO4−y system. J Low Temp Phys 68, 419–425 (1987). https://doi.org/10.1007/BF00682306
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DOI: https://doi.org/10.1007/BF00682306