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Published on: May 29, 2018
Evolution of the Nematic Susceptibility in LaFe_{1-x}Co_{x}AsO
Xiaochen Hong1, Federico Caglieris1, Rhea Kappenberger1
1Leibniz-Institute for Solid State and Materials Research (IFW Dresden), 01069 Dresden, Germany.
Abstract:
We report a systematic elastoresistivity study on LaFe_{1-x}Co_{x}AsO single crystals, which have well separated structural and magnetic transition lines. All crystals show a Curie-Weiss-like nematic susceptibility in the tetragonal phase. The extracted nematic temperature is monotonically suppressed upon cobalt doping, and changes sign around the optimal doping level, indicating a possible nematic quantum critical point beneath the superconducting dome. The amplitude of the nematic susceptibility shows a peculiar double-peak feature. This could be explained by a combined effect of different contributions to the nematic susceptibility, which are amplified at separated doping levels of LaFe_{1-x}Co_{x}AsO.
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