21 October 1992 Electron phonon relaxation dynamics of superconducting niobium as a function of temperature
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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.
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Margarita Mihailidi, Margarita Mihailidi, Qirong Xing, Qirong Xing, Kwong Mow Yoo, Kwong Mow Yoo, Robert R. Alfano, Robert R. Alfano, } "Electron phonon relaxation dynamics of superconducting niobium as a function of temperature", Proc. SPIE 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors, (21 October 1992); doi: 10.1117/12.137674; https://doi.org/10.1117/12.137674
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