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VOLUME 46 (1987) | ISSUE 3 | PAGE 122
Electronic excitations and luminescence of Y1Ba2Cu307 superconducting metal-insulator ceramics
Luminescence and nonradiative transitions accompanied by the production of defects have been observed for the first time in a superconducting metal-insulator system in which a broad energy gap lies above a nearly filled valence band. The particular material was Y1Ba2Cu307. At 10 K, an emission is observed at 3.355 eV. This emission may involve a Bose condensation of biholes.