Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide Superconductor BaFe1:8Co0:2As2
Williams, Tess L.
Wang, W. F.
Chen, X. H.
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CitationYin, Yi, Martin Zech, Tess L. Williams, W. F. Wang, G. Wu, X. H. Chen, and Jennifer E. Hoffman. 2009. Physical Review Letters 102(9): 097002.
AbstractWe present an atomic resolution scanning tunneling spectroscopy study of superconducting
BaFe1.8Co0.2As2 single crystals in magnetic fields up to 9 T. At zero field, a single gap with coherence
peaks at [untranscribable character] = 6:25 meV is observed in the density of states. At 9 and 6 T, we image a disordered vortex
lattice, consistent with isotropic, single flux quantum vortices. Vortex locations are uncorrelated with
strong-scattering surface impurities, demonstrating bulk pinning. The vortex-induced subgap density of
states fits an exponential decay from the vortex center, from which we extract a coherence length [untranscribable character] =
27:6 +/- 2:9 [untranscribable character], corresponding to an upper critical field Hc2 = 43 T.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3009616
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