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Superconductivity in the tetragonal phase of La[sub 1. 9]Bi[sub 0. 1]CuO[sub 4+[delta]] annealed under high oxygen pressure

Conference · · Journal of Superconductivity; (United States)
OSTI ID:7166494
We have investigated the relation between the crystal structure and superconductivity in La[sub 1.9]Bi[sub 0.1]CuO[sub 4+[delta]], in which the phase separation observed in La[sub 2]CuO[sub 4+[delta]] is suppressed. A phase diagram in the T [delta] plane is given for La[sub 1.9]Bi[sub 0.1]CuO[sub 4+[delta]] with excess oxygen. For very small [delta] values, the crystal structure is orthorhombic, and an orthorhombic tetragonal phase transition occurs markedly at [delta] approximately 0.03 in the measured temperature range between 13 and 293 K. Superconductivity is observed in the range of 0.04 [approx lt] [delta] [approx lt] 0.11. This is clear evidence that high-Tc superconductivity also appears in the tetragonal phase. 5 refs., 2 figs.
OSTI ID:
7166494
Report Number(s):
CONF-930710--
Conference Information:
Journal Name: Journal of Superconductivity; (United States) Journal Volume: 7:1
Country of Publication:
United States
Language:
English