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Phys Rev Lett. 2003 Dec 19;91(25):257201. Epub 2003 Dec 15.

Spin correlations among the charge carriers in an ordered stripe phase.

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Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom.


We have observed a diffuse component to the low-energy magnetic excitation spectrum of stripe-ordered La(5/3)Sr(1/3)NiO4 probed by neutron inelastic scattering. The diffuse scattering forms a square pattern with sides parallel and perpendicular to the stripe directions. The signal is dispersive, with a maximum energy of approximately 10 meV. Probed at 2 meV, the scattering decreases in strength with increasing temperature, and is barely visible at 100 K. We argue that the signal originates from dynamic, quasi-one-dimensional, antiferromagnetic correlations among the stripe electrons.

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