Abstract
Using low temperature scanning tunnelling microscopy/spectroscopy (STM/STS) we haveinvestigated the vortex behaviours of two-dimensional superconducting Pb films atdifferent thicknesses. STS at the vortex core shows an evolution of electronicstates with film thickness. Transition from the clean limit to the dirty limit ofsuperconductivity is identified, which can be ascribed to the decreased electronic meanfree path induced by stronger scattering from the disordered interface at smallerthicknesses. A magnetic field dependent vortex core size is observed even for such a low-κ superconductor. The weak pinning induced by surface defects leads to the formation of adistorted hexagonal vortex lattice.
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