title: Spin correlations among the charge carriers in an ordered stripe phase.
abstract: 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.
authors.affiliation: Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom.
authors.forename: A T
authors.initials: AT
authors.lastname: Boothroyd
authors.forename: P G
authors.initials: PG
authors.lastname: Freeman
authors.forename: D
authors.initials: D
authors.lastname: Prabhakaran
authors.forename: A
authors.initials: A
authors.lastname: Hiess
authors.forename: M
authors.initials: M
authors.lastname: Enderle
authors.forename: J
authors.initials: J
authors.lastname: Kulda
authors.forename: F
authors.initials: F
authors.lastname: Altorfer