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Updated: Jan 20, 2026

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Published on: February 10, 2020
Ultrafast time-resolved x-ray scattering reveals diffusive charge order dynamics in La2- Ba CuO4
Matteo Mitrano1,2, Sangjun Lee1,2, Ali A Husain1,2
1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Abstract:
Charge order is universal among high-T c cuprates, but its relation to superconductivity is unclear. While static order competes with superconductivity, dynamic order may be favorable and even contribute to Cooper pairing. Using time-resolved resonant soft x-ray scattering at a free-electron laser, we show that the charge order in prototypical La2- Ba CuO4 exhibits transverse fluctuations at picosecond time scales. These sub-millielectron volt excitations propagate by Brownian-like diffusion and have an energy scale remarkably close to the superconducting T c. At sub-millielectron volt energy scales, the dynamics are governed by universal scaling laws defined by the propagation of topological defects. Our results show that charge order in La2- Ba CuO4 exhibits dynamics favorable to the in-plane superconducting tunneling and establish time-resolved x-rays as a means to study excitations at energy scales inaccessible to conventional scattering techniques.
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