Observation of surface superconductivity and direct vortex imaging of a Pb thin island with a scanning tunneling microscopeY. X. Ning, C. L. Song, Z. L. Guan, X. C. Ma, Xi Chen, J. F. Jia and Q. K. XueEPL, 85 2 (2009) 27004DOI: https://doi.org/10.1209/0295-5075/85/27004