Wavelength-dependent optical enhancement of superconducting interlayer coupling 
in La1.885Ba0.115CuO4

Casandruc, E.; Nicoletti, D.; Rajasekaran, S.; Laplace, Y.; Khanna, V.; Gu, G. D.; Hill, J. P.; Cavalleri, A.

doi:10.1103/PhysRevB.91.174502

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Wavelength-dependent optical enhancement of superconducting interlayer coupling in La_1.885Ba_0.115CuO₄

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Casandruc, E.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science, Hamburg, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Nicoletti, D.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science, Hamburg, Germany;

Rajasekaran, S.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science, Hamburg, Germany;

Laplace, Y.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science, Hamburg, Germany;

Khanna, V.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science, Hamburg, Germany;
Department of Physics, Clarendon Laboratory, University of Oxford;
Diamond Light Source;

Cavalleri, A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science, Hamburg, Germany;
Department of Physics, Clarendon Laboratory, University of Oxford;

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http://dx.doi.org/10.1103/PhysRevB.91.174502
(Publisher version)

http://arxiv.org/abs/1505.02167
(Preprint)

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PhysRevB.91.174502.pdf
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Citation

Casandruc, E., Nicoletti, D., Rajasekaran, S., Laplace, Y., Khanna, V., Gu, G. D., et al. (2015). Wavelength-dependent optical enhancement of superconducting interlayer coupling in La_1.885Ba_0.115CuO₄. Physical Review B, 91(17): 174502. doi:10.1103/PhysRevB.91.174502.

Cite as: https://hdl.handle.net/21.11116/0000-0007-17A1-9

Abstract

We analyze the pump wavelength dependence for the photoinduced enhancement of interlayer coupling in La_1.885Ba_0.115CuO₄, which is promoted by optical melting of the stripe order. In the equilibrium superconducting state (T < T_C = 13K) in which stripes and superconductivity coexist, time-domain terahertz spectroscopy reveals a photoinduced blueshift of the Josephson plasma resonance after excitation with optical pulses polarized perpendicular to the CuO₂ planes. In the striped nonsuperconducting state (T_C < T < T _SO ≃ 40K) a transient plasma resonance similar to that seen below T_C appears from a featureless equilibrium reflectivity. Most strikingly, both these effects become stronger upon tuning of the pump wavelength from the midinfrared to the visible, underscoring an unconventional competition between stripe order and superconductivity, which occurs on energy scales far above the ordering temperature.