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; Michael Schuett; J. Schmalian; R. M. Fernandes; D. Reznik

doi:10.1103/PhysRevB.98.014516

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, Michael Schuett, J. Schmalian, R. M. Fernandes, D. Reznik

Physics and Astronomy (Twin Cities)

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12 Scopus citations

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 language	English (US)
Article number	014516
Journal	Physical Review B
Volume	98
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.98.014516
State	Published - Jul 24 2018

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© 2018 American Physical Society.

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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.",

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AU - Weber, F.

AU - Parshall, D.

AU - Pintschovius, L.

AU - Castellan, J. P.

AU - Kauth, M.

AU - Merz, M.

AU - Wolf, Th

AU - Schuett, Michael

AU - Schmalian, J.

AU - Fernandes, R. M.

AU - Reznik, D.

PY - 2018/7/24

Y1 - 2018/7/24

N2 - 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.

AB - 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.

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

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