Slow Electron-Phonon Cooling in Superconducting Diamond Films
Nadezhda Titova (Moscow State University of Education)
Anna I. Kardakova (Moscow State University of Education)
Nina Tovpeko (Moscow State University of Education)
Sergey Ryabchun (National Research University Higher School of Economics (HSE University), Moscow State University of Education)
Soumen Mandal (Cardiff University)
Dmitry Morozov (Cardiff University)
Georgina M. Klemencic (Cardiff University)
Sean R. Giblin (Cardiff University)
Oliver A. Williams (Cardiff University)
Gregory N. Goltsman (National Research University Higher School of Economics (HSE University), Moscow State University of Education)
T. M. Klapwijk (Kavli institute of nanoscience Delft, TU Delft - QN/Kavli Nanolab Delft, TU Delft - QN/Klapwijk Lab)
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Abstract
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.
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