Slow Electron-Phonon Cooling in Superconducting Diamond Films

Nadezhda Titova, Anna I. Kardakova, Nina Tovpeko, Sergey Ryabchun, Soumen Mandal, Dmitry Morozov, Georgina M. Klemencic, Sean R. Giblin, Oliver A. Williams, Gregory N. Goltsman, T. M. Klapwijk

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We have measured the electron-phonon energy-relaxation time, τeph, in superconducting boron-doped diamond films grown on silicon substrate by chemical vapor deposition. The observed electron-phonon cooling times vary from 160 ns at 2.70 K to 410 ns at 1.8 K following a T-2-dependence. The data are consistent with the values of τeph previously reported for single-crystal boron-doped diamond films epitaxially grown on diamond substrate. Such a noticeable slow electron-phonon relaxation in boron-doped diamond, in combination with a high normal-state resistivity, confirms a potential of superconducting diamond for ultrasensitive superconducting bolometers.

Original languageEnglish
Article number7779132
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - 1 Jun 2017


  • electron-phonon time
  • Superconducting boron-doped diamond
  • superconducting nanobolometers


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