Abstract
We report inelastic neutron scattering study of the antiferromagnetic spin stripe fluctuations above the spin stripe melting temperature ${\mathrm{T}}_{so}\ensuremath{\approx}190\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ in the hole doped ${\mathrm{Pr}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{4+\ensuremath{\delta}}$ with stripe incommensurability $\ensuremath{\epsilon}=0.33$. The fluctuations are nondispersive and detected upto 10 meV at the incommensurate wave vector indicating a persisting instantaneous spin and charge stripe correlation above ${\mathrm{T}}_{so}$, while they are strongly diminished already below the charge stripe melting temperature ${\mathrm{T}}_{co}\ensuremath{\approx}255\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, which indicates that static charge stripe order is essential for the dynamical spin stripe correlation to exist. Furthermore, it also suggests that the presence of spin stripe fluctuations is not a prerequisite for the formation of static charge stripes.
Published Version
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