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Freezing of a stripe liquid
S-H Lee1, J M Tranquada, K Yamada
1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Physical Review Letters
|March 23, 2002
Summary
Neutron scattering reveals a stripe-liquid phase in layered nickelates. This phase shows evolving magnetic fluctuations and overdamped spin waves within charge stripes.
Area of Science:
- Condensed matter physics
- Materials science
- Solid-state chemistry
Background:
- Layered nickelates exhibit complex electronic phases.
- Charge ordering and magnetic fluctuations are key phenomena.
Purpose of the Study:
- To demonstrate the existence of a stripe-liquid phase in La(1.725)Sr(0.275)NiO(4).
- To investigate the interplay between magnetic fluctuations and charge ordering.
Main Methods:
- Neutron scattering measurements.
- Parametrization using a damped-harmonic-oscillator model.
Main Results:
- Evidence for a stripe-liquid phase was found.
- Incommensurate magnetic fluctuations evolve continuously through the charge-ordering temperature.
- An abrupt decrease in effective damping energy was observed upon cooling.
Conclusions:
- The stripe-liquid phase is characterized by overdamped spin waves.
- Charge stripes dynamically define antiferromagnetic domains.