PT Journal
AU Kardakova, A
   Shishkin, A
   Semenov, A
   Goltsman, GN
   Ryabchun, S
   Klapwijk, TM
   Bousquet, J
   Eon, D
   Sacépé, B
   Klein, T
   Bustarret, E
TI Relaxation of the resistive superconducting state in boron-doped diamond films
SO Phys. Rev. B
JI Phys. Rev. B
PY 2016
BP 064506
VL 93
IS 6
DI 10.1103/PhysRevB.93.064506
DE boron-doped diamond films; resistive superconducting state; relaxation time
AB We report a study of the relaxation time of the restoration of the resistive superconducting state in single crystalline boron-doped diamond using amplitude-modulated absorption of (sub-)THz radiation (AMAR). The films grown on an insulating diamond substrate have a low carrier density of about 2.5×1021cm−3 and a critical temperature of about 2K. By changing the modulation frequency we find a high-frequency rolloff which we associate with the characteristic time of energy relaxation between the electron and the phonon systems or the relaxation time for nonequilibrium superconductivity. Our main result is that the electron-phonon scattering time varies clearly as T−2, over the accessible temperature range of 1.7 to 2.2 K. In addition, we find, upon approaching the critical temperature Tc, evidence for an increasing relaxation time on both sides of Tc.
ER