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Tunneling Spectroscopy and Vortex Imaging in Boron-Doped Diamond

B. Sacepe·C. Chapelier·C. Marcenat·J. Kacmarcik·T. Klein·M. Bernard·E. Bustarret
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Abstract

We present the first scanning tunneling spectroscopy study of single-crystalline boron doped diamond. The measurements were performed below 100 mK with a low temperature scanning tunneling microscope. The tunneling density of states displays a clear superconducting gap. The temperature evolution of the order parameter follows the weak coupling BCS law with $Δ(0)/k_B T_c \simeq 1.74$. Vortex imaging at low magnetic field also reveals localized states inside the vortex core that are unexpected for such a dirty superconductor.

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B. Sacepe, C. Chapelier, C. Marcenat, J. Kacmarcik, T. Klein, M. Bernard, E. Bustarret. 2006-01-13. Tunneling Spectroscopy and Vortex Imaging in Boron-Doped Diamond. https://doi.org/10.1103/physrevlett.96.097006

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