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Magnetic-field tuning of photo-induced superconductivity in striped La2-xBaxCuO4

MPS-Authors
/persons/resource/persons133789

Nicoletti,  D.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons199421

Fu,  D.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Mehio,  O.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Moore,  S.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons199432

Disa,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons133811

Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford;

External Resource

https://arxiv.org/abs/1803.05420
(Preprint)

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1803.05420.pdf
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Citation

Nicoletti, D., Fu, D., Mehio, O., Moore, S., Disa, A., Gu, G. D., et al. (2018). Magnetic-field tuning of photo-induced superconductivity in striped La2-xBaxCuO4.


Cite as: https://hdl.handle.net/21.11116/0000-0001-E612-7
Abstract
Optical excitation of stripe-ordered La2−xBaxCuO4 has been shown to transiently enhance superconducting tunneling between the CuO2 planes. This effect was revealed by a blue-shift, or by the appearance of a Josephson Plasma Resonance in the terahertz-frequency optical properties. Here, we show that this photo-induced state can be strengthened by the application of high external magnetic fields oriented along the c-axis. For a 7-Tesla field, we observe up to a ten-fold enhancement in the transient interlayer phase correlation length, accompanied by a two-fold increase in the relaxation time of the photo-induced state. These observations are highly surprising, since static magnetic fields suppress interlayer Josephson tunneling and stabilize stripe order at equilibrium. We interpret our data as an indication that optically-enhanced interlayer coupling in La2−xBaxCuO4 does not originate from a strengthening of the equilibrium superconductor that competes with stripes, as previously hypothesized. Rather, these results suggest that the photo-induced state may emerge from activated tunneling between optically-excited pair-density-waves in adjacent planes.