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29 March 2024
 
  » pubmed » pmid11005988

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Exploring the dynamics of superconductors by time-resolved far-infrared spectroscopy
G L Carr ; R P Lobo ; J LaVeigne ; D H Reitze ; D B Tanner ;
Date 2 Oct 2000
Journal Phys Rev Lett, 85 (14), 3001-4
AbstractWe have examined the recombination of excess quasiparticles in superconducting Pb by time-resolved far-infrared spectroscopy using a pulsed synchrotron source. The energy gap shift calculated by Owen and Scalapino [Phys. Rev. Lett. 28, 1559 (1972)] is directly observed, as is the associated reduction in the Cooper pair density. The relaxation process involves a two-component decay; the faster ( approximately 200 ps) is associated with the actual (effective) recombination process, while the slower ( approximately 10 to 100 ns) is due to heat transport across the film/substrate interface. The temperature dependence of the recombination process between 0. 5T(c) and 0.85T(c) is in good agreement with theory.
Source PubMed, pmid11005988
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