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Low-Energy Electrodynamics of Superconducting Diamond

M. Ortolani, S. Lupi, L. Baldassarre, U. Schade, P. Calvani, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada

DOI 10.1103/PhysRevLett.97.097002 · Physical Review Letters

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Abstract

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 2Δ, the field penetration depth λ, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function α2F(ω). We conclude that diamond behaves as a dirty BCS superconductor.

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