Abstract
Pump–probe spectroscopy has been used to study quasiparticle dynamics in a superconducting Nb0.5Ti0.5N thin film subject to a parallel magnetic field. The broadband, time-resolved, photo-induced far-infrared transmission S(t) was measured and used to extract a time-dependent effective recombination rate τeff-1(t). We found that τeff-1(t) decreases with increasing field. The rate τeff-1(t) is found to scale with S(t) at high laser fluence.
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