Heavily boron-doped, diamond films can become superconducting with critical temperatures T-c 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 2 Delta, the field penetration depth lambda, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function alpha F-2(omega). We conclude that diamond behaves as a dirty BCS superconductor.
Low-energy electrodynamics of superconducting diamond / Ortolani, Michele; Lupi, Stefano; Baldassarre, Leonetta; U., Schade; Calvani, Paolo; Y., Takano; M., Nagao; T., Takenouchi; H., Karawada. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 97:9(2006), pp. 097002-1-097002-4. [10.1103/physrevlett.97.097002]
Low-energy electrodynamics of superconducting diamond
ORTOLANI, MICHELE;LUPI, Stefano;BALDASSARRE, Leonetta;CALVANI, Paolo;
2006
Abstract
Heavily boron-doped, diamond films can become superconducting with critical temperatures T-c 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 2 Delta, the field penetration depth lambda, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function alpha F-2(omega). We conclude that diamond behaves as a dirty BCS superconductor.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
