Photoinduced operation and diagnostic of superconductivity in the MgB2 films
| Autor: | Mohammed Shahabuddin, Salem A. S. Qaid, Romain Viennois, C. Reibel, M. S. Shah, I.V. Kityk, S. Soltan, Nasser S. Alzayed, A.M. El-Naggar |
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| Rok vydání: | 2013 |
| Předmět: |
Superconductivity
Phase transition Thin layers Materials science business.industry Second-harmonic imaging microscopy Second-harmonic generation Nanosecond Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Wavelength Microsecond Optoelectronics Electrical and Electronic Engineering business |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 24:4585-4589 |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | The occurrence of the optical second harmonic generation (SHG) at fundamental wavelength of Er:glass nanosecond 1,540 nm stimulated by two coherent CO2 microsecond laser beams at wavelengths 10.6 and 5.3 μm was observed for the MgB2 films. The SHG signal has shown its sensitivity to the occurrence of the superconducting (SC) phase transition. The SHG achieves its maximum at temperatures higher with respect to the SC transition. The effect is reversible with respect to the photo induced treatment. After the switching off of the external photoinducing treatment the effect almost disappears. However, this still strongly affects the SC properties of the MgB2 thin layers, as the critical current is increased by 50 % after illumination. |
| Databáze: | OpenAIRE |
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