Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.067001
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 1143, 247310070, SPP1458, BU887/15-1, DFG-GRK 1621, AS 523/4-1, CA1931/1-1, WU595/3-3]
- Leibniz-DAAD Research Fellowship
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [647276-MARS-ERC-2014-CoG]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter ct.qmat [EXC 2147, 390858490]
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We report a systematic clastorcsistivity study on LaFe1-xCoxAsO 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 LaFe1-xCoxAsO.
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