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Spin correlations among the charge carriers in an ordered stripe phase
A T Boothroyd1, P G Freeman, D Prabhakaran
1Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom.
Physical Review Letters
|February 3, 2004
Summary
Researchers observed dynamic magnetic excitations in stripe-ordered La(5/3)Sr(1/3)NiO4 using neutron scattering. These excitations reveal quasi-one-dimensional antiferromagnetic correlations within the material
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Stripe-ordered materials like La(5/3)Sr(1/3)NiO4 exhibit complex electronic and magnetic properties.
- Understanding low-energy magnetic excitations is crucial for characterizing magnetic ordering and dynamics.
Purpose of the Study:
- To investigate the low-energy magnetic excitation spectrum of stripe-ordered La(5/3)Sr(1/3)NiO4.
- To elucidate the origin of diffuse scattering observed in the magnetic excitation spectrum.
Main Methods:
- Neutron inelastic scattering was employed to probe magnetic excitations.
- Analysis focused on the diffuse scattering patterns and their temperature dependence.
Main Results:
- A diffuse scattering component was observed in the low-energy magnetic excitation spectrum.
- The scattering formed a square pattern, indicative of stripe correlations.
- The signal exhibited dispersion up to ~10 meV and weakened significantly with increasing temperature.
Conclusions:
- The observed diffuse scattering is attributed to dynamic, quasi-one-dimensional antiferromagnetic correlations.
- These correlations are associated with the stripe electrons in La(5/3)Sr(1/3)NiO4.