Evidence of zero-point fluctuation of vortices in a very weakly pinned <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>a</mml:mi></mml:math> -MoGe thin film

In a Type II superconductor, the vortex core behaves like normal metal. Consequently, single-particle density of states in conventional superconductor remains either flat or (for very clean single crystals) exhibits peak at zero bias due to formation Caroli-de Gennes-Matricon bound state inside core. Here we report an unusual observation from scanning tunneling spectroscopy measurements weakly pinned thin film s-wave a-MoGe, namely, that soft gap local continues exist even center We ascribe this rapid fluctuation vortices about their mean position blurs boundary between gapless and gapped superconducting region outside. Analyzing data as function magnetic field show variation amplitude is consistent with quantum zero-point motion vortices.