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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconductivity: Fe-based Superconductors – 122 and 111

TT 31.11: Talk

Tuesday, March 17, 2015, 12:30–12:45, H 2053

Persistence of high-energy spin fluctuations in electron doped NaFeAs — •Jonathan Pelliciari1, Yaobo Huang1, 2, Marcus Dantz1, Valentina Bisogni1, Paul Olalde Velasco1, Changqing Jin2, and Thorsten Schmitt11Paul Scherrer Institute, Villigen, Switzerland — 2Institute of Physics Chinese Academy of Sciences, Beijing, China

Resonant Inelastic X-ray Scattering (RIXS) is a powerful method for probing spin fluctuations in cuprate and iron pnictide superconductors [1, 2]. We present a high resolution Fe L3 RIXS study of parent and superconducting NaFe1−xCoxAs. Spectral shape decomposition reveals the persistence of broad dispersive magnetic excitations for all doping levels. In contrast to previous RIXS experiments on hole-doped Ba1−xKxFe2As2 compounds [1], the energy of such modes is not affected by doping. The magnetic weight per iron atom of such magnons and paramagnons remains constant. However, renormalized per formula unit the magnetic weight decreases with doping. We argue that cobalt-doping is mainly tuning the electronic correlations without affecting the dispersion range of the magnetic excitations, only reducing their intensity.


[1] K. J. Zhou et al, Nat. Comm., 4, 1470 (2013)

[2. M. P. M. Dean et al, Nature Materials 12, 1019 (2013)

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