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Proceedings Paper

Electron-phonon coupling constant λ (acoustic) of YBaCuO deduced from the photoresistive response
Author(s): Jean-Paul Maneval; Phan Hong Khoi; Roger W. Bland; Fatiha Chibane
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Paper Abstract

Laser pulses were applied to granular, and c-axis oriented, YBa2Cu3Ox films current-biased in a resistive state, and the decay of the transient voltage was monitored as a function of time. At low enough temperatures and fluences (approximately equals 1 nJ per cm2 per pulse), the decay rate follows a T3-dependence characteristic of electron energy loss to acoustic phonons. Above about 7 K, the response time of 300 angstroms films stays constant at 2.4 nsec, in agreement with the bolometric response observed by others. In the range of dominant electron-phonon interaction, the response time contains direct information about the coupling constant (lambda) , via a formula derived by P.B. Allen. However, as in ultrasonic attenuation, the limitation of the electron mean free path must be taken into account. A support for this procedure is the approximate proportionality of the relaxation time upon the room temperature resistivity, i.e. the electron mean free path. We thus obtain a value of (lambda) appropriate to the acoustic mode interaction.

Paper Details

Date Published: 20 May 1994
PDF: 8 pages
Proc. SPIE 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric, (20 May 1994); doi: 10.1117/12.176143
Show Author Affiliations
Jean-Paul Maneval, Ecole Normale Superieure de Paris (France)
Phan Hong Khoi, Ecole Normale Superieure de Paris (France)
Roger W. Bland, Ecole Normale Superieure de Paris (France)
Fatiha Chibane, Ecole Normale Superieure de Paris (France)


Published in SPIE Proceedings Vol. 2159:
High-Temperature Superconducting Detectors: Bolometric and Nonbolometric
Michael Nahum; Jean-Claude Villegier, Editor(s)

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