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  Two pump frequency resonances for light-induced superconductivity in YBa2Cu3O6.5?

Liu, B., Först, M., Fechner, M., Nicoletti, D., Porras, J., Keimer, B., et al. (2019). Two pump frequency resonances for light-induced 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/21.11116/0000-0004-F1B4-0
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1905.08356.pdf (Preprint), 5MB
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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: Optical excitation in the cuprates has been shown to induce transient superconducting correlations above the thermodynamic transition temperature, TC, as evidenced by the terahertz frequency optical properties in the non-equilibrium state. In YBa2Cu3O6+x? this phenomenon has so far been associated with the nonlinear excitation of certain lattice modes and the creation of new crystal structures. In other compounds, like La2-xBaxCuO4, similar effects were reported also for excitation at near infrared frequencies, and were interpreted as a signature of the melting of competing orders. However, to date it has not been possible to systematically tune the pump frequency widely in any one compound, to comprehensively compare the frequency dependent photo-susceptibility for this phenomenon. Here, we make use of a newly developed optical parametric amplifier, which generates widely tunable high intensity femtosecond pulses, to excite YBa2Cu3O6.5 throughout the entire optical spectrum (3 - 750 THz). In the far-infrared region (3 - 25 THz), signatures of non-equilibrium superconductivity are induced only for excitation of the 16.4 THz and 19.2 THz vibrational modes that drive c-axis apical oxygen atomic positions. For higher driving frequencies (25 - 750 THz), a second resonance is observed around the charge transfer band edge at ~350 THz. These observations highlight the importance of coupling to the electronic structure of the CuO2 planes, either mediated by a phonon or by charge transfer.

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Language(s): eng - English
 Dates: 2019-10-102019-05-20
 Publication Status: Published online
 Pages: 47
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1905.08356
 Degree: -

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