Low-Energy Electrodynamics of Superconducting Diamond

Authors :: Masanori Nagao
Stefano Lupi
Ulrich Schade
Leonetta Baldassarre
Hiroshi Kawarada
Paolo Calvani
T. Takenouchi
Yoshihiko Takano
Michele Ortolani
Source :: Physical review letters, 97 (2006)., info:cnr-pdr/source/autori:Ortolani, M; Lupi, S; Baldassarre, L; Schade, U; Calvani, P; Takano, Y; Nagao, M; Takenouchi, T; Kawarada, H/titolo:Low-energy electrodynamics of superconducting diamond/doi:/rivista:Physical review letters (Print)/anno:2006/pagina_da:/pagina_a:/intervallo_pagine:/volume:97
Publication Year :: 2006
Publisher :: American Physical Society (APS), 2006.
Abstract: Heavily-boron-doped diamond films 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, the field penetration depth, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function. We conclude that diamond behaves as a dirty BCS superconductor.<br />Comment: 4 pages including 3 figures

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