Low-energy electrodynamics of superconducting diamond.
Heavily boron-doped, diamond films can become superconducting with critical temperatures Tc well above 4 K. Here we first measure the reflectivity of such a film down to 5 cm(-1), by also using coherent synchrotron radiation. We thus determine the optical gap 2Delta, the field penetration depth lambda, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function alpha2F(omega). We conclude that diamond behaves as a dirty BCS superconductor.
Ortolani
M
M
CNR-INFM Coherentia and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro, 2, 00185 Roma, Italy.
Lupi
S
S
Baldassarre
L
L
Schade
U
U
Calvani
P
P
Takano
Y
Y
Nagao
M
M
Takenouchi
T
T
Kawarada
H
H