Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.13: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Charge density wave in Li doped NaFeAsJose M. Guevara1, •Sven Hoffmann1, Zhixiang Sun1, Steffen Sykora1, Yevhen Kushnirenko1, Alexander Fedorov1, Chanhee Kim2, Aga Shahee2, Dilipkumar Bhoi2, Kee Hoon Kim2, Saicharan Aswartham1, Sergei Borisenko1, 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

The hierarchy between superconductivity, magnetism and charge order remains as an indecipherable and breathtaking puzzle in solid state physics. Clarifying the role of these interaction is immensely important to understand the pairing mechanism of superconductivity in Iron-based superconductors. Here, we use SI-STS to visualize the atomic-scale electronic structure of Na0.96Li0.04FeAs. We find short range electronic order in the LDOS with a periodicity ∼ 8 nm. We use q-selective STS and angle-resolved photoemission to find a gap with value 2Δ=15 meV and an appropriate nesting vector of q2kF ∼ 0.05 π/aFe in the dyz band at the Γ point, respectively. These observations are a clear signature of a band-selective charge density wave (CDW). We conjecture that the band-selective CDW is responsible for the change in the spin-fluctuations and therefore resulted in a different nematic state. We compared these findings with results for the parent compound NaFeAs.

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