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  Which phonons induce non-equilibrium superconductivity in YBa2Cu3O6.5?

Liu, B., Först, M., Fechner, M., Nicoletti, D., Porras, J., Keimer, B., et al. (2019). Which phonons induce non-equilibrium superconductivity in YBa2Cu3O6.5?

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-A4EC-A Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A4F1-3
Genre: Paper

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1905.08356.pdf (Preprint), 4MB
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https://arxiv.org/abs/1905.08356 (Preprint)
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 Creators:
Liu, B.1, Author              
Först, M.1, Author              
Fechner, M.1, Author              
Nicoletti, D.1, Author              
Porras, J.2, Author
Keimer, B.2, Author
Cavalleri, A.1, 3, 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, Stuttgart, ou_persistent22              
3Department of Physics, University of Oxford, Clarendon Laboratory, ou_persistent22              

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 Abstract: Terahertz-frequency excitation in the cuprates has been shown to induce non-equilibrium superconducting correlations above the thermodynamic transition temperature, TC. In YBa2Cu3O6+x, this phenomenon has been associated with the nonlinear excitation of certain lattice modes. However, to date it has not been possible to tune the pump wavelength widely to systematically compare the effect of different modes. Aided by a newly developed optical device, we measured the response of YBa2Cu3O6.5 to tuneable driving between 3 and 24 THz, covering all phonon resonances. We show that superconductivity is enhanced only for excitation of the 16.4 THz and 19.2 THz vibrational modes that modulate the position of apical oxygen atoms along the c axis. Other phonons only enhance the dissipation. We argue here that not only the average deformation of the lattice, but also a direct coupling between lattice vibrations and the electronic structure of the CuO2 planes should contribute to enhanced non-equilibrium superconductivity.

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Language(s): eng - English
 Dates: 2019-05-20
 Publication Status: Published online
 Pages: 31
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1905.08356
 Degree: -

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