Characterization of high Tc superconductor by luminescence methods
Abstract
High-Tc superconductors have been investigated by photoluminescence (PL) and X-ray excited thermally stimulated luminescence (TSL) techniques. Characteristic PLs have been observed in the infrared region in the Er-Ba-Cu-O and Nd-Ba-Cu-O systems, which are tentatively assigned to electronic transitions between weakly crystal-field-split spin-orbit levels of trivalent Er and Nd ions. The spectral shapes and/or peak positions are dependent on the crystal arrangement surrounding the rare-earth ion. Such PLs have never been obtained in the Eu-Ba-Cu-O and Yb-Ba-Cu-O systems. TSL measurements have been performed with particular emphasis on the Gd-Ba-Cu-O system. Characteristic TSLs have been observed in this system, depending on the composition, preparation conditions and cumulative X-ray irradiation time. The activation energy of the related traps ranges from 0.1 eV to 0.3 eV. Characteristic TSLs have also been observed in the Ho-Ba-Cu-O and new high-Tc superconducting systems containing no rare-earth elements.
- Publication:
-
IEEE Transactions on Magnetics
- Pub Date:
- March 1989
- DOI:
- 10.1109/20.92829
- Bibcode:
- 1989ITM....25.2563F
- Keywords:
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- Copper Oxides;
- High Temperature Superconductors;
- Photoluminescence;
- Rare Earth Compounds;
- Thermoluminescence;
- Electron Transitions;
- Superconducting Films;
- Thin Films;
- Transition Temperature;
- Solid-State Physics