Nematic correlation length in optimally doped Ba(Fe0.94Co0.06)2As2
Nematicity is ubiquitous in electronic phases of high-Tc superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they have been restricted to uniform or momentum averaged fluctuations. In previous experiments using inelastic neutron and x-ray scattering we have measured the softening of the in-plane polarized transverse acoustic phonon along the [010] direction, which is sensitive to the shear modulus C66 and, hence, to nematic fluctuations. We showed [Weber PRB 2018] that these measurements can be used to extract the nematic correlation length ξ in Ba(Fe0.94Co0.06)2As2. However, a precise determination and clear connection of the neutron scattering results to ultrasound data at q = 0, necessitate high-resolution experiments only possible on a high-flux cold triple-axis spectrometer such as THALES. Hence, we ask for 7 days of beam time in order to measure the transverse acoustic dispersion at very low energies and momenta.
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The recommended format for citing this dataset in a research publication is in the following format:
WEBER Frank; LI Zehua and STEFFENS Paul. (2020). Nematic correlation length in optimally doped Ba(Fe0.94Co0.06)2As2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-522
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