Soft phonons reveal the nematic correlation length in Ba(Fe0.94Co0.06)2As2

F. Weber, D. Parshall, L. Pintschovius, J. P. Castellan, M. Kauth, M. Merz, Th Wolf, M. Schütt, J. Schmalian, R. M. Fernandes, D. Reznik

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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. Here, we investigate the behavior of finite-momentum nematic fluctuations by utilizing the anomalous softening of acoustic phonon modes in optimally doped Ba(Fe0.94Co0.06)2As2. We determine the nematic correlation length and find that it sharply changes its T dependence at Tc, revealing a strong connection between nematicity and superconductivity.

Original languageEnglish (US)
Article number014516
JournalPhysical Review B
Issue number1
StatePublished - Jul 24 2018

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© 2018 American Physical Society.


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