Scanning tunneling spectroscopy on single crystal MgB2статья
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Аннотация:We report on the results of scanning tunneling spectroscopy measurements on single crystals of MgB2. Tunneling was performed both parallel and perpendicular to the crystalline c-axis. In the first case, a single superconducting gap (Delta(pi) = 2.2 meV) associated with the pi-band is observed. Tunneling parallel to the ab-plane reveals an additional, larger gap (Delta(sigma) similar to 7 meV) originating in the highly 2D sigma-band. Vortex imaging in the pi-band was performed with the field and tunnel current parallel to the c-axis. The vortices have a large core size compared to estimates based on H-c2, and show an absence of localized states in the core. Furthermore, superconductivity between the vortices is rapidly suppressed by an applied field. A comparison to specific heat measurements is performed. (C) 2002 Elsevier Science B.V. All rights reserved.