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  Probing coherent charge fluctuations in YBa2Cu3O6+x at wavevectors outside the light cone

von Hoegen, A., Fechner, M., Först, M., Porras, J., Keimer, B., Michael, M., et al. (2019). Probing coherent charge fluctuations in YBa2Cu3O6+x at wavevectors outside the light cone.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-3B6A-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-3B6B-2
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1911.08284.pdf (Preprint), 6MB
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1911.08284.pdf
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https://arxiv.org/abs/1911.08284 (Preprint)
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 Creators:
von Hoegen, A.1, Author              
Fechner, M.1, Author              
Först, M.1, Author              
Porras, J.2, Author
Keimer, B.2, Author
Michael, M.3, Author
Demler, E.3, Author
Cavalleri, A.1, 4, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Max Planck Institute for Solid State Research, ou_persistent22              
3Department of Physics, Harvard University, ou_persistent22              
4Department of Physics, University of Oxford, ou_persistent22              

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 Abstract: The possible existence of phase-incoherent superconductivity in the normal state of cuprates is one of the grand unsolved problems of modern condensed matter physics. Optical spectroscopy shows that long-range superconducting correlations disappear at Tc, although other momentum-integrated probes provide evidence for residual coherence in the normal state. Here, we use nonlinear TeraHertz spectroscopy to excite and probe coherent charge fluctuations in YBa2Cu3O6+x at frequencies and wavevectors that lie outside the light cone accessed by linear optics. In the superconducting state, we show that three-wave mixing between one optically driven phonon and two Josephson Plasma Polaritons excites coherent c-axis supercurrents at 2.4 THz and at in-plane wavevectors qy > 1000 cm−1. As Tc is crossed, these finite momentum supercurrent oscillations evolve continuously into a seemingly identical charge fluctuation mode, which survives up to the pseudogap temperature T*. We argue that these results are best explained by the existence of short-range superconducting fluctuations throughout the pseudogap phase of YBa2Cu3O6+x.

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Language(s): eng - English
 Dates: 2019-11-19
 Publication Status: Published online
 Pages: 43
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1911.08284
 Degree: -

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