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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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