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arXiv · 1607.06207

Restoring Interlayer Josephson Coupling in La_{1.885}Ba_{0.115}CuO_4 by Charge Transfer Melting of Stripe Order

V. Khanna·R. Mankowsky·M. Petrich·H. Bromberger·S. A. Cavill·E. Moehr-Vorobeva·D. Nicoletti·Y. Laplace·G. D. Gu·J. P. Hill·M. Forst·A. Cavalleri·S. S. Dhesi
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Abstract

We show that disruption of charge-density-wave (stripe) order by charge transfer excitation, enhances the superconducting phase rigidity in La_{1.885}Ba_{0.115}CuO_4 (LBCO). Time-Resolved Resonant Soft X-Ray Diffraction demonstrates that charge order melting is prompt following near-infrared photoexcitation whereas the crystal structure remains intact for moderate fluences. THz time-domain spectroscopy reveals that, for the first 2 ps following photoexcitation, a new Josephson Plasma Resonance edge, at higher frequency with respect to the equilibrium edge, is induced indicating enhanced superconducting interlayer coupling. The fluence dependence of the charge-order melting and the enhanced superconducting interlayer coupling are correlated with a saturation limit of about 0.5 mJ/cm2. Using a combination of x-ray and optical spectroscopies we establish a hierarchy of timescales between enhanced superconductivity, melting of charge order and rearrangement of the crystal structure.

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V. Khanna, R. Mankowsky, M. Petrich, H. Bromberger, S. A. Cavill, E. Moehr-Vorobeva, D. Nicoletti, Y. Laplace, G. D. Gu, J. P. Hill, M. Forst, A. Cavalleri, S. S. Dhesi. 2016-07-21. Restoring Interlayer Josephson Coupling in La_{1.885}Ba_{0.115}CuO_4 by Charge Transfer Melting of Stripe Order. https://doi.org/10.1103/physrevb.93.224522

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