Observation of sharp-line lanthanide fluorescence in high temperature superconductors |
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| Institution: | 1. Institute of Geochemistry SB RAS, Favorskii St. 1a, Irkutsk, 664033, Russian Federation;2. Institute of Solid State Physics, University of Latvia, 8 Kengaraga Iela, LV-1063, Riga, Latvia;1. Institute of Solid State Physics, University of Latvia, 8 Kengaraga iela, LV-1063 Riga, Latvia;2. Department of Photon Science, Deutches Elektronen Synhrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany;1. Vinogradov Institute of Geochemistry SB RAS, 1a Favorskii street, 664033 Irkutsk, Russia;2. Institute of Solid State Physics, University of Latvia, Riga, Latvia;3. MAX IV Laboratory, Lund University, Lund, Sweden |
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| Abstract: | Lanthanide fluorescence has been observed for the first time in the high temperature superconductors that have been recently discovered. Laser excited fluorescence and fluorescence excitation spectra of La1.85-xRExSr0.15CuO4 for RE=Pr and Eu and x=0.02, 0.18, 0.36 and 1.85 are presented. There is substantial inhomogeneous broadening caused by the Sr2+ in the materials containing a single rare earth and additional broadening caused by the ionic size mismatch in the materials with two rare earths. The samples have 3 crystallographic sites for the lanthanide ion. No fluorescence was observed for the higher temperature superconductors, Y1Ba2Cu3O9-δ, doped with 10 and 100% Eu3+. |
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