Dopant clustering, electronic inhomogeneity, and vortex pinning in iron-based superconductors

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Dopant clustering, electronic inhomogeneity, and vortex pinning in iron-based superconductors

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Title: Dopant clustering, electronic inhomogeneity, and vortex pinning in iron-based superconductors
Author: Song, Can-Li; Yin, Yi; Zech, Martin; Williams, Tess; Yee, Michael Manchun; Chen, Gen-Fu; Luo, Jian-Lin; Wang, Nan-Lin; Hudson, E. W.; Hoffman, Jennifer Eve

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Citation: Song, Can-Li, Yi Yin, Martin Zech, Tess Williams, Michael M. Yee, Gen-Fu Chen, Jian-Lin Luo, Nan-Lin Wang, E. W. Hudson, and Jennifer E. Hoffman. 2013. “Dopant Clustering, Electronic Inhomogeneity, and Vortex Pinning in Iron-Based Superconductors.” Phys. Rev. B 87 (21) (June): 214519.
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Abstract: We use scanning tunneling microscopy to map the surface structure, nanoscale electronic inhomogeneity, and vitreous vortex phase in the hole-doped superconductor Sr0.75K0.25Fe2As2 with Tc=32 K. We find that the low-T cleaved surface is dominated by a half Sr/K termination with 1×2 ordering and ubiquitous superconducting gap, while patches of gapless, unreconstructed As termination appear rarely. The superconducting gap varies by σ/Δ¯=16% on a ∼3 nm length scale, with average 2Δ¯/kBTc=3.6 in the weak-coupling limit. The vortex core size provides a measure of the superconducting coherence length ξ=2.3 nm. We quantify the vortex lattice correlation length at 9 T in comparison to several iron-based superconductors. The comparison leads us to suggest the importance of dopant size mismatch as a cause of dopant clustering, electronic inhomogeneity, and strong vortex pinning.
Published Version: doi:10.1103/PhysRevB.87.214519
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:12748089
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