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Restoring interlayer Josephson coupling in La 1.885 Ba 0.115 CuO 4 by charge transfer melting of stripe order

DOI: 10.1103/PhysRevB.93.224522 DOI Help

Authors: V. Khanna (Diamond Light Source; Max Planck Institute for the Structure and Dynamics of Matter; Department of Physics, University of Oxford) , R. Mankowsky (Max Planck Institute for the Structure and Dynamics of Matter; Centre for Free Electron Laser Science) , M. Petrich (Max Planck Institute for the Structure and Dynamics of Matter; Centre for Free Electron Laser Science) , H. Bromberger (Max Planck Institute for the Structure and Dynamics of Matter; Centre for Free Electron Laser Science) , S. Cavill (Diamond Light Source; Department of Physics, University of York) , E. Möhr-vorobeva (Department of Physics, University of Oxford) , D. Nicoletti (Max Planck Institute for the Structure and Dynamics of Matter; Centre for Free Electron Laser Science) , Y. Laplace (Max Planck Institute for the Structure and Dynamics of Matter; Centre for Free Electron Laser Science) , G. D. Gu (NSLS-II and Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory) , J. P. Hill (NSLS-II and Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory) , M. Foerst (Max Planck Institute for the Structure and Dynamics of Matter; Centre for Free Electron Laser Science) , A. Cavalleri (Max Planck Institute for the Structure and Dynamics of Matter; Department of Physics, University of Oxford; Centre for Free Electron Laser Science) , S. Dhesi (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 93 , PAGES 224522

State: Published (Approved)
Published: June 2016
Diamond Proposal Number(s): 7497 , 7942 , 8207

Abstract: We show that disruption of charge-density-wave (stripe) order by charge transfer excitation, enhances the superconducting phase rigidity in La1.885Ba0.115CuO4. 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 ∼0.5mJ/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.

Subject Areas: Physics


Instruments: I06-Nanoscience

Added On: 01/07/2016 14:58

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