Evidence for Fluctuating Charge Stripes far above the Charge-Ordering Transition in La${}_{1.67}$ Sr${}_{0.33}$ NiO${}_4$

Abstract

The temperature evolution of structural effects associated with charge (CO) and spin order (SO) in La${}_{1.67}$Sr${}_{0.33}$NiO${}_4$ has been investigated using neutron powder diffraction. We report an anomalous shrinking of the $c/a$ lattice parameter ratio that correlates with $T_{\mathrm{CO}}$. The sign of this change can be explained by the change in interlayer Coulomb energy between the static stripe-ordered state and the fluctuating stripe-ordered state or the charge-disordered state. In addition, we identify a contribution to the mean-square displacements of Ni and in-plane O atoms whose width correlates quite well with the size of the pseudogap extracted from the reported optical conductivity, with a non-Debye-like component that persists below and well above $T_{\mathrm{CO}}$. We infer that dynamic charge-stripe correlations survive to $T\sim 2T_{\mathrm{CO}}$

5 pages

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