Study of photoresponse of high‐TcY‐Ba‐Cu‐O superconducting ultrathin films using a picosecond laser pulse train
| Autor: | Guolin Huang, Donghwan Kim, Chris Lehane, Hoi Sing Kwok, Lei Shi |
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| Rok vydání: | 1993 |
| Předmět: |
Superconductivity
Resistive touchscreen Materials science Physics and Astronomy (miscellaneous) business.industry Photoconductivity Analytical chemistry Physics::Optics Condensed Matter::Superconductivity Excited state Optoelectronics Intermediate state Laser power scaling Thin film business Excitation |
| Zdroj: | Applied Physics Letters. 63:2830-2832 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | We have systematically studied the photoresponse of Y‐Ba‐Cu‐O (YBCO) ultrathin films to a train of picosecond laser pulses. The onset and decay of nonequilibrium superconductivity due to different levels of optical excitation can be observed within the single pulse train. Thermal and nonthermal responses can be clearly identified. In addition, the superconducting film resistance was found to increase progressively with laser power above the onset threshold. The YBCO thin films were possibly excited into a nonequilibrium intermediate (resistive) state from the superconducting state. The laser intensity dependence indicated a nonthermal origin for these voltage pulses. |
| Databáze: | OpenAIRE |
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