Unexpected weak spatial variation of local density of sates induced by individual Co impurity atoms in Na(Fe0.95Co0.05)As as revealed by scanning tunneling spectroscopy

Details Unexpected weak spatial variation of local density of sates induced by individual Co impurity atoms in Na(Fe0.95Co0.05)As as revealed by scanning tunneling spectroscopy Unexpected weak spatial variation of local density of sates induced by individual Co impurity atoms in Na(Fe0.95Co0.05)As as revealed by scanning tunneling spectroscopy

2012-03-14

arxiv.org/abs/1203.3123v1

Physics

Condensed Matter

Superconductivity

29 pages, 11 figures

Scientific paper

The pairing mechanism in the iron pnictides and chalcogenides remains as a hot and unresolved issue. The widely perceived picture is the S+- model. One of the puzzles concerning this model is why superconductivity survives up to a relatively high temperature in some doped samples, such as the Ba(Fe1-xTx)2As2 (T=Co, Ni, Ru, etc.), where the dopants are supposed to be the pair breakers. It has long been a desire to visualize microscopically how strong the scattering effect is in the iron pnictides. Here we show the spatially resolved scanning tunneling spectroscopy in Na(Fe0.95Co0.05)As. We successfully identified the Co-impurities and investigated the spatial distribution of LDOS at different energies. We see a continuum of the in-gap states which lift the zero-bias conductivity to a finite value, however the spectrum shows negligible variation when going through the Co impurity site. This dichotomy effect is explained with the possible S+- and S++ models.

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