MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS VI—NON-RESONANT MICROWAVE ABSORPTION IN ULTRA-THIN Bi-Sr-Ca-Cu-O FILMS
| Autor: | K. Sugawara, Y. Shiohara, S. Tanaka, D.J. Baar, Tsunemi Sugimoto |
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| Rok vydání: | 1992 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Absorption spectroscopy Analytical chemistry Statistical and Nonlinear Physics Substrate (electronics) Metalorganic vapour phase epitaxy Atmospheric temperature range Condensed Matter Physics Absorption (electromagnetic radiation) Critical field Microwave |
| Zdroj: | Modern Physics Letters B. :265-272 |
| ISSN: | 1793-6640 0217-9849 |
| Popis: | Non-resonant microwave absorption (NRMA) studies have been done for Bi-Sr-Ca-Cu-O (BSCCO) films with thicknesses of 30 Å and 15 Å fabricated on MgO substrate by MOCVD. For the latter two kinds of samples have been fabricated: BSCCO/MgO and BiOx/BSCCO/MgO . NRMA signals have been detected up to about 70–75 K for all the samples. The lower critical magnetic field H c1 * of the 30 Å film was severely increased by the application of a magnetic field of several kGauss, whereas it is almost unaffected in the case of 15 Å films. H c1 * increases but the signal intensity decreases with increasing temperature for all the 30 Å and 15 Å samples. The temperature dependence of the intensity is quite different from that of thicker films (100 Å and 350 Å), in which the intensity vs. temperature relation has a peak (or peaks) at particular temperature(s). |
| Databáze: | OpenAIRE |
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