Abstract
We report on the results of scanning tunneling spectroscopy measurements on single crystals of MgB2. Tunneling was performed parallel to the crystalline c-axis, and a single superconducting gap (Δπ=2.2 meV) associated with the π-band is observed. Vortex imaging in the π-band was performed with the field parallel to the c-axis. The vortices are found to be organized in a well-ordered hexagonal lattice.
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