# Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide Superconductor BaFe1:8Co0:2As2

 Title: Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron Pnictide Superconductor BaFe1:8Co0:2As2 Author: Zech, Martin; Chen, X. H.; Yin, Yi; Williams, Tess L.; Wang, W. F.; Wu, G.; Hoffman, Jennifer Note: Order does not necessarily reflect citation order of authors. Citation: Yin, 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. Full Text & Related Files: Yin_ScanningTunellingIronPnictide.pdf (989.6Kb; PDF) Abstract: We 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. Published Version: http://dx.doi.org/10.1103/PhysRevLett.102.097002 Other Sources: http://arxiv.org/abs/0810.1048 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3009616

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