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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Abstract

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
Volume98
Issue number1
DOIs
StatePublished - Jul 24 2018

Bibliographical note

Funding Information:
F.W. was supported by the Helmholtz Young Investigator Group under Contract No. VH-NG-840. M.M. was supported by the Karlsruhe Nano-Micro Facility (KNMF). D.R. was supported by the DOE, Office of Basic Energy Sciences, Office of Science, under Contract No. DE-SC0006939. R.M.F. and M.S. are supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Award No. DE-SC0012336. Part of the work by D.R. and J.S. was performed at the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.

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