Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Fe-based Superconductors - Other Materials and Theory

TT 15.7: Vortrag

Montag, 1. April 2019, 16:30–16:45, H23

Checkerboard electronic structure in Na0.96Li0.04FeAs — •Jose M. Guevara1, Zhixiang Sun1, Steffen Sykora1, Chanhee Kim2, Aga Shahee2, Dilipkumar Bhoi2, Kee Hoon Kim2, Bernd Büchner1, and Christian Hess11Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01069 Dresden, Germany — 2CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea

Electronic order recently emerged as a general ingredient of unconventional superconductivity. A prominent example is the checkerboard electronic order, present in the pseudo-gap regime of the cuprates.

Lately, a new type of electronic order, lacking magnetic order has been reported in Li doped NaFeAs. We performed spectroscopic imaging scanning tunneling microscopy to reveal this new electronic order in real space and to clarify its relation with the nematic and superconducting phases. We present here evidence of electronic order that strikingly resembles the checkerboard order in the cuprates. Our finding thus constitutes the first example of this type of order in the iron-based superconductor (IBS). We characterize the associated q-vector equal to ∼0.182π/aFe and discuss it in the context of further evidence of electronic order in the IBS.

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