Tunneling Spectroscopy and Vortex Imaging in Boron-Doped Diamond

B. Sacépé (1) , C. Chapelier (1) , C. Marcenat (1) , J. Kacmarcik (1, 2, 3) , Thierry Klein (3) , M. Bernard (3) , E. Bustarret (3)

1 SPSMS - UMR 9001 - Service de Physique Statistique, Magnétisme et Supraconductivité
2 CLTP IEP - Centre of Low Temperature Physics
3 LEPES - Laboratoire d'Etudes des Propriétés Electroniques des Solides

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 0 =kBTc ' 1:74. Vortex imaging at low magnetic field also reveals localized states inside the vortex core that are unexpected for such a dirty superconductor.

Domaines: Supraconductivité [cond-mat.supr-con]

B. Sacépé, C. Chapelier, C. Marcenat, J. Kacmarcik, Thierry Klein, et al.. Tunneling Spectroscopy and Vortex Imaging in Boron-Doped Diamond. Physical Review Letters, 2006, 96, pp.097006. ⟨10.1103/PhysRevLett.96.097006⟩. ⟨hal-00957724⟩