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Stripe phases in the two-dimensional Falicov-Kimball model
R Lemański1, J K Freericks, G Banach
1Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland.
Physical Review Letters
|November 22, 2002
Summary
Charge stripe order in nickelates and cuprates is explored using the Falicov-Kimball model. The study reveals distinct regions illustrating phase separation or magnetic interactions as stripe mechanisms.
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Charge stripe order is observed in doped nickelate and cuprate materials.
- Theoretical efforts focus on understanding the stripe phase mechanism.
- The Hubbard model suggests two possibilities: phase separation or a compromise between itinerancy and magnetic interactions.
Purpose of the Study:
- To determine the restricted phase diagram of the two-dimensional Falicov-Kimball model.
- To illustrate the mechanisms underlying charge stripe order.
Main Methods:
- Numerical studies of the Falicov-Kimball model.
- Phase diagram determination.
Main Results:
- The two-dimensional Falicov-Kimball model exhibits a rich phase diagram.
- Different regions of the phase diagram illustrate both phase separation and magnetic interaction mechanisms for stripe order.
Conclusions:
- The Falicov-Kimball model provides a framework to understand competing mechanisms of charge stripe order.
- The model successfully illustrates how stripe order can arise from different physical interactions.