期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.157002
关键词
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资金
- LCLS
- Stanford University through the Stanford Institute for Materials Energy Sciences (SIMES)
- Lawrence Berkeley National Laboratory (LBNL) [DE-AC02-05CH11231]
- University of Hamburg through the BMBF priority program [FSP 301]
- Center for Free Electron Laser Science (CFEL)
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Science and Engineering [DE-AC02-76SF00515]
- U.S. Department of Energy, Division of Materials Science [DE-AC02-98CH10886]
- European Research Council under the European Union [319286 (Q-MAC)]
- German Research Foundation [DFG-SFB 925]
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 the LTT distortion, prevent superconductivity in equilibrium.
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