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arXiv · 2411.16614

Intrinsic Quasiparticle Lifetime in a Superconducting Aluminum

Konrad Norowski·Marek Foltyn·Alexander Savin·Maciej Zgirski
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Abstract

We use time-resolved thermometry to monitor the decay of nonequilibrium quasiparticles in superconducting Al in the temperature range from $0.3\,$K to $1.2\,$K. The quasiparticle lifetime at higher temperatures ($T>0.7\,$K) agrees well with the calculated energy flow from electrons to phonons, but at lower temperatures it is significantly shorter than the theory predicts. We show well-defined internal equilibrium of quasiparticle system in the studied thermal transients, which implicates that quasiparticle-quasiparticle relaxation is much faster than electron-phonon interaction.

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Konrad Norowski, Marek Foltyn, Alexander Savin, Maciej Zgirski. 2024-11-25. Intrinsic Quasiparticle Lifetime in a Superconducting Aluminum. https://arxiv.org/abs/2411.16614

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