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Partial disorder in an Ising-spin Kondo lattice model on a triangular lattice
Hiroaki Ishizuka1, Yukitoshi Motome
1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
Researchers discovered a novel partially disordered phase in a triangular lattice Ising-spin Kondo model. This phase, featuring both magnetic order and paramagnetic moments, arises from the interplay of spin and charge degrees of freedom.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Statistical Mechanics
Background:
- Ising-spin Kondo lattice models are crucial for understanding magnetism in materials.
- Previous models often struggled to stabilize partially disordered magnetic phases.
Purpose of the Study:
- Investigate the phase diagram of an Ising-spin Kondo lattice model on a triangular lattice near 1/3 filling.
- Identify and characterize novel magnetic and electronic phases.
Main Methods:
- Utilized Monte Carlo simulations to explore the model's phase space.
- Analyzed the interplay between spin and charge degrees of freedom.
Main Results:
- Identified a partially disordered phase coexisting magnetic order and paramagnetic moments.
- This phase is stabilized by the competition between stripe and ferrimagnetic phases at finite temperatures.
- Observed accompanying charge order and a resulting electronic band gap.
Conclusions:
- The nonperturbative interplay between spin and charge is key to stabilizing partial disorder.
- This finding offers new insights into complex magnetic phenomena in correlated electron systems.
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