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Soft phonons reveal the nematic correlation length in 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. Here, we investigate the behavior of finite-momentum nem...

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Bibliographic Details
Published in:Physical review. B 2018-07, Vol.98 (1)
Main Authors: Weber, F, Parshall, D, Pintschovius, L, Castellan, J-P, Kauth, M, Merz, M, Wolf, Th, Schütt, M, Schmalian, J, Fernandes, R M, Reznik, D
Format: Article
Language:English
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.014516