We investigate the order parameter dynamics of the stripe-ordered nickelate, La1.75Sr0.25NiO4, using time-resolved resonant X-ray diffraction. In spite of distinct spin and charge energy scales, the two order parameters' amplitude dynamics are found to be linked together due to strong coupling. Additionally, the vector nature of the spin sector introduces a longer re-orientation time scale which is absent in the charge sector. These findings demonstrate that the correlation linking the symmetry-broken states does not unbind during the non-equilibrium process, and the time scales are not necessarily associated with the characteristic energy scales of individual degrees of freedom.
@article{arxiv.1302.4522,
title = {Real-time manifestation of strongly coupled spin and charge order parameters in stripe-ordered nickelates via time-resolved resonant x-ray diffraction},
author = {Y. D. Chuang and W. S. Lee and Y. F. Kung and A. P. Sorini and B. Moritz and R. G. Moore and L. Patthey and M. Trigo and D. H. Lu and P. S. Kirchmann and M. Yi and O. Krupin and M. Langner and Y. Zhu and S. Y. Zhou and D. A. Reis and N. Huse and J. S. Robinson and R. A. Kaindl and R. W. Schoenlein and S. L. Johnson and M. Forst and D. Doering and P. Denes and W. F. Schlotter and J. J. Turner and T. Sasagawa and Z. Hussain and Z. X. Shen and T. P. Devereaux},
journal= {arXiv preprint arXiv:1302.4522},
year = {2015}
}