Recombination-limited energy relaxation in a Bardeen-Cooper-Schrieffer superconductor

Research output: Contribution to journalArticle


Research units

  • Landau Institute for Theoretical Physics
  • Russian Academy of Sciences
  • CNR
  • Scuola Normale Superiore di Pisa


We study quasiparticle energy relaxation at subkelvin temperatures by injecting hot electrons into an Al island and measuring the energy flux from quasiparticles into phonons both in the superconducting and in the normal state. The data show strong reduction of the flux at low temperatures in the superconducting state, in qualitative agreement with the theory for clean superconductors. However, quantitatively the energy flux exceeds the theoretical predictions both in the superconducting and in the normal state, suggesting an enhanced or additional relaxation process.


Original languageEnglish
Article number017003
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 1 Jul 2009
MoE publication typeA1 Journal article-refereed

    Research areas

  • Cooper pair, quasiparticle energy relaxation, superconductor

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