Pair-breaking and superconducting state recovery dynamics in MgB2.

نویسندگان

  • J Demsar
  • R D Averitt
  • A J Taylor
  • V V Kabanov
  • W N Kang
  • H J Kim
  • E M Choi
  • S I Lee
چکیده

We present studies of the photoexcited quasiparticle dynamics in MgB2 where, using femtosecond optical techniques, Cooper pair-breaking dynamics (PBD) have been temporally resolved for the first time. The PBD are strongly temperature and photoexcitation intensity dependent. Analysis of the PBD using the Rothwarf-Taylor equations suggests that the anomalous PBD arises from the fact that in MgB2 photoexcitation is initially followed by energy relaxation to high frequency phonons instead of, as commonly assumed, e-e thermalization. Furthermore, the bare quasiparticle recombination rate and the probability for pair breaking by phonons have been determined.

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عنوان ژورنال:
  • Physical review letters

دوره 91 26 Pt 1  شماره 

صفحات  -

تاریخ انتشار 2003