Direct real time measurement of quasiparticle lifetimes in a superconductor

Mark Johnson

doi:10.1103/PhysRevLett.67.374

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Direct real time measurement of quasiparticle lifetimes in a superconductor

Mark Johnson

DOI 10.1103/PhysRevLett.67.374 · Physical Review Letters

T1

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Abstract

A short laser pulse breaks Cooper pairs and photoexcites electrons in a superconducting film of niobium. As the quasiparticles recombine and rejoin the condensate, changes in the electrodynamic response of the sample are detected by a fast oscilloscope. The observed biexponential decay is consistent with a previous measurement. The fast recovery time is used to obtain the pair recombination time, which is in good agreement with theory.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.2	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.8	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.7	Pressure not reported	unknown