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Proceedings Paper

Electron phonon relaxation dynamics of superconducting niobium as a function of temperature
Author(s): Margarita Mihailidi; Qirong Xing; Kwong Mow Yoo; Robert R. Alfano
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Paper Abstract

The temperature dependence of the electron-phonon relaxation and of the electron-phonon coupling constant for a metal (Nb) has been determined for temperatures ranging from room temperature (292 K) to below superconducting temperatures (4.5 K). The measured rise time of the transmittance change decreases from 370 fs at 292 K to 205 fs at 4.5 K. The electron- phonon coupling constant decreases from 20 X 1017 at 292 K to 0.5 X 1017 W m-3s-1 at 4.5 K. The cooling of the lattice after being heated by the pump pulse shows an increase in the cooling speed when the sample is below superconducting temperature. This faster decay may be attributed to the cooling due to formation of Cooper pairs.

Paper Details

Date Published: 21 October 1992
PDF: 8 pages
Proc. SPIE 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors, (21 October 1992); doi: 10.1117/12.137674
Show Author Affiliations
Margarita Mihailidi, Institute for Ultrafast Spectroscopy and Lasers/CUNY (United States)
Qirong Xing, Institute for Ultrafast Spectroscopy and Lasers/CUNY (United States)
Kwong Mow Yoo, Institute for Ultrafast Spectroscopy and Lasers/CUNY (United States)
Robert R. Alfano, Institute for Ultrafast Spectroscopy and Lasers/CUNY (United States)


Published in SPIE Proceedings Vol. 1677:
Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors

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