Melting of Charge Stripes in Vibrationally Driven La1.875Ba0.125CuO4: Assessing 
the Respective Roles of Electronic and Lattice Order in Frustrated 
Superconductors

Först, M.; Tobey, R. I.; Bromberger, H.; Wilkins, S. B.; Khanna, V.; Caviglia, A. D.; Chuang, Y.-D.; Lee, W. S.; Schlotter, W. F.; Turner, J. J.; Minitti, M. P.; Krupin, O.; Xu, Z. J.; Wen, J. S.; Gu, G. D.; Dhesi, S. S.; Cavalleri, A.; Hill, J. P.

doi:10.1103/PhysRevLett.112.157002

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Melting of Charge Stripes in Vibrationally Driven La_1.875Ba_0.125CuO₄: Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors

MPS-Authors

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

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

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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;
Center for Free Electron Laser Science and University of Hamburg;

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http://dx.doi.org/10.1103/PhysRevLett.112.157002
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http://arxiv.org/abs/1406.2483
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Citation

Först, M., Tobey, R. I., Bromberger, H., Wilkins, S. B., Khanna, V., Caviglia, A. D., et al. (2014). Melting of Charge Stripes in Vibrationally Driven La_1.875Ba_0.125CuO₄: Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors. Physical Review Letters, 112(15): 157002. doi:10.1103/PhysRevLett.112.157002.

Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-3376-9

Abstract

We report femtosecond resonant soft x-ray diffraction measurements of the dynamics of the charge order and of the crystal lattice in nonsuperconducting, stripe-ordered La_1.875Ba_0.125CuO₄. Excitation of the in-plane Cu-O stretching phonon with a midinfrared pulse has been previously shown to induce a transient superconducting state in the closely related compound La_1.675Eu_0.2Sr_0.125CuO₄. In La_1.875Ba_0.125CuO₄, we find that the charge stripe order melts promptly on a subpicosecond time scale. Surprisingly, the low temperature tetragonal (LTT) distortion is only weakly reduced, reacting on significantly longer time scales that do not correlate with light-induced superconductivity. This experiment suggests that charge modulations alone, and not the LTT distortion, prevent superconductivity in equilibrium.