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Low-energy electrodynamics of superconducting diamond

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

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M. Ortolani, S. Lupi, L. Baldassarre, P. Calvani, U. Schade, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada. 2006-02-06. Low-energy electrodynamics of superconducting diamond. https://doi.org/10.1103/physrevlett.97.097002

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