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Titolo:
Optical control of magnetic flux quanta in YBCO thin film loops by selected femtosecond laser pulses
Autore:
Tonouchi, M; Shikita, K; Morimoto, M; Hangyo, M;
Indirizzi:
Osaka Univ, Res Ctr Superconductor Photon, Suita, Osaka 5650871, Japan Osaka Univ Suita Osaka Japan 5650871 Photon, Suita, Osaka 5650871, Japan PRESTO, Japan Sci & Technol Corp, JST, Suita, Osaka 5650871, Japan PRESTOSuita Osaka Japan 5650871 l Corp, JST, Suita, Osaka 5650871, Japan
Titolo Testata:
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
fascicolo: 1, volume: 11, anno: 2001,
parte:, 3
pagine: 3939 - 3942
SICI:
1051-8223(200103)11:1<3939:OCOMFQ>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TERAHERTZ RADIATION; SUPERCURRENT DISTRIBUTION; THZ RADIATION; VISUALIZATION; GENERATION; EMISSION;
Keywords:
terahertz radiation; femtosecond laser; magnetic flux; nonequilibrium state;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Tonouchi, M Osaka Univ, Res Ctr Superconductor Photon, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan Osaka Univ 2-2 Yamadaoka Suita Osaka Japan 5650871 0871, Japan
Citazione:
M. Tonouchi et al., "Optical control of magnetic flux quanta in YBCO thin film loops by selected femtosecond laser pulses", IEEE APPL S, 11(1), 2001, pp. 3939-3942

Abstract

We report on an optical magnetic flux control in high-Tc superconductive loops and films using a femtosecond (fs) laser. The YBa2Cu3O7-delta (YBCO) films are patterned into strips with two rectangular parallel holes, with ordered arrays of antidots, or without any holes. The fs optical pulses are focused onto the strips while biasing the current. After removal of the biascurrent, the supercurrent density distributions are visualized by terahertz radiation imaging. The images indicate that the flux and anti-flux quantaare optically generated in the strips, and the number of the flux quanta between 15 and 2000 flux quantum is controlled by both the bias current and laser power. We then put forward the system to control the number of the fspulses to generate the flux. The results reveal that even single shot fs optical pulse can generate the flux quanta in the strips.

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Documento generato il 23/01/20 alle ore 03:18:29