Discovery of superconductivity in the surface of -In by STM/STS.[ 9 ] (a) Typical STM image of the -In surface with atomic resolution. Quadrangle indicates the unit cell. (b) d I /d V curves measured at varied temperatures with an Nb tip. (c) Superconductive energy gap deduced from the experimental data in panel (b). Solid curve is a BCS fitting result, indicating T c = 3.18 K. |