We have confirmed the presence of three metamorphic phases of Ba 2 ErCu 3 O 7-δ , which correspond to those of Ba 2 YCu 3 O 7-δ . In addition to the high T c (92 K) orthorhombic phase, we obtained another orthorhombic phase and a tetragonal phase by rapid quenching. The former has a lower T c value of 50 K and the latter is semiconducting. Both the temperature dependence of resistivity and the T c value of each phase are similar to those of the yttrium system. It is likely that the common relation between the structure and superconducting properties exists for other rare earth systems as well.
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Takabatake et al. (1987) studied this question.
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