Tunneling spectroscopy and vortex imaging in boron-doped diamond.
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 Delta(0)/kBTc approximately 1.74. Vortex imaging at low magnetic field also reveals localized states inside the vortex core that are unexpected for such a dirty superconductor.
Sacépé
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DRFMC-SPSMS, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France. benjamin.sacepe@cea.fr
Chapelier
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Marcenat
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Kacmarcik
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Klein
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Bernard
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Bustarret
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