3 years ago

# Ultrafast time-resolved x-ray scattering reveals diffusive charge order dynamics in La$_{2-x}$Ba$_x$CuO$_4$.

Alexander H. Reid, Tim van Driel, Scott F. Wandel, William Schlotter, Young Il Joe, Sean Hartnoll, Matteo Mitrano, Peter Abbamonte, Ali A. Husain, Genda D. Gu, John Schneeloch, Gilberto de la Peña Munoz, Nigel Goldenfeld, Giacomo Coslovich, Minhui Zhu, Stella Sun, Sangjun Lee, Luca Delacretaz

Charge order is universal among high-T$_c$ cuprates but its relevance to superconductivity is not established. It is widely believed that, while static order competes with superconductivity, dynamic order may be favorable and even contribute to Cooper pairing. We use time-resolved resonant soft x-ray scattering to study the collective dynamics of the charge order in the prototypical cuprate, La$_{2-x}$Ba$_x$CuO$_4$. We find that, at energy scales $0.4$ meV $\lesssim \omega \lesssim 2$ meV, the excitations are overdamped and propagate via Brownian-like diffusion. At energy scales below 0.4 meV the charge order exhibits dynamic critical scaling, displaying universal behavior arising from propagation of topological defects. Our study implies that charge order is dynamic, so may participate tangibly in superconductivity.

Publisher URL: http://arxiv.org/abs/1808.04847

DOI: arXiv:1808.04847v1

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