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