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We performed the first scanning tunneling spectroscopy measurements on thepyrochlore superconductor KOs2O6 (Tc = 9.6 K) in both zero magnetic field andthe vortex state at several temperatures above 1.95 K. This material presentsatomically flat surfaces, yielding spatially homogeneous spectra which revealfully-gapped superconductivity with a gap anisotropy of 30%. Measurementsperformed at fields of 2 and 6 T display a hexagonal Abrikosov flux linelattice. From the shape of the vortex cores, we extract a coherence length of31-40 {\AA}, in agreement with the value derived from the upper critical fieldHc2. We observe a reduction in size of the vortex cores (and hence thecoherence length) with increasing field which is consistent with theunexpectedly high and unsaturated upper critical field reported.

Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the beta-pyrochlore KOs2O6