Physics – Condensed Matter – Superconductivity
Scientific paper
2007-04-04
Phys. Rev. Lett. 101, 057004 (2008)
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, Revtex 4
Scientific paper
10.1103/PhysRevLett.101.057004
We performed the first scanning tunneling spectroscopy measurements on the pyrochlore superconductor KOs2O6 (Tc = 9.6 K) in both zero magnetic field and the vortex state at several temperatures above 1.95 K. This material presents atomically flat surfaces, yielding spatially homogeneous spectra which reveal fully-gapped superconductivity with a gap anisotropy of 30%. Measurements performed at fields of 2 and 6 T display a hexagonal Abrikosov flux line lattice. From the shape of the vortex cores, we extract a coherence length of 31-40 {\AA}, in agreement with the value derived from the upper critical field Hc2. We observe a reduction in size of the vortex cores (and hence the coherence length) with increasing field which is consistent with the unexpectedly high and unsaturated upper critical field reported.
Berthod Christophe
Bukowski Zbigniew
Cuttat I.
Dubois Catherine
Fischer Øystein
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