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TT: Fachverband Tiefe Temperaturen
TT 52: Superconductivity: Fe-based Superconductors - FeSe and LiFeAs
TT 52.12: Vortrag
Mittwoch, 14. März 2018, 12:30–12:45, HFT-FT 101
Nematic fluctuations in Li doped NaFeAs — •Jose M. Guevara1, Zhixiang Sun1, Steffen Sykora1, Chanhee Kim2, Aga Shahee2, Dilipkumar Bhoi2, Kee Hoon Kim2, Bernd Büchner1, and Christian Hess1 — 1Leibniz-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
In strongly correlated electronic systems, the electronic distribution favors local variations, often forming patterns that break the rotational symmetry of the crystal. Nematicity has special relevance in systems where competiton of different phases plays an important role, and has been observed in the most prominent families of high temperature su- perconductors, i.e. cuprates and iron-pnictides. The Li doped NaFeAs samples allows a new approach to explore nematicity in Iron-pnictides, given the strong differences of the phase diagram in the parents compounds, NaFeAs and LiFeAs.
In our work, we measure 3%, 4% and 5% Li doped NaFeAs samples, where longe range order is suppressed, with a low temperature scanning tunneling microscope. We visualize the real-space distribution of the nematic fluctuations, which are found to ubiquitously exist, from the superconducting state to the normal state at higher temperatures.