Luminescence of high-temperature single-crystal superconductors cleaved in ultrahigh vacuum
V. G. Stankevitch, N. Yu. Svechnikov, K. V. Kaznacheev, M. Kamada, S. Tanaka, S. Hirose, R. Kink, G. A. Emel’chenko, S. G. Karabachev, T. Wolf, H. Berger, F. Levy
DOI 10.1103/PhysRevB.47.1024 · Physical Review B
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Abstract
Experimental confirmation of the existence of intrinsic luminescence in YBa2Cu3O7−x and Bi2Sr2CaCu2O8+x high-temperature superconductors has been obtained by investigation of luminescence and reflectivity spectra of single crystals cleaved at liquid-helium temperatures in ultrahigh vacuum. A correlation between the radiation instability (photon-stimulated desorption of oxygen molecules) and the quenching of the intrinsic luminescence has also been obtained from the dependence on the synchrotron-radiation photon flux. We conclude that the luminescence originates from an oxygen quasimolecule formed as a result of electron-excitation localization in a Cu-O plane.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3-xAlxO7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 76 | Pressure not reported | unknown |
| Bi2-xPbxSr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
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