Melting of Charge Stripes in Vibrationally Driven La1.875Ba0.125CuO4: Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors
- Foerst, 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.
DOIAbstract
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 La1.875Ba0.125CuO4. 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 La1.675Eu0.2Sr0.125CuO4. In La1.875Ba0.125CuO4, 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...
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