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Published on: May 15, 2017
Continuous quantum phase transition in a Kndo lattice model
Jian-Xin Zhu1, D R Grempel, Qimiao Si
1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Physical Review Letters
|November 13, 2003
Summary
This study investigates magnetic quantum phase transitions in anisotropic Kondo lattice models. Researchers found finite-temperature transitions are first-order, while zero-temperature transitions are continuous and locally critical.
Area of Science:
- Condensed matter physics
- Quantum magnetism
Background:
- Kondo lattice models exhibit complex magnetic behaviors due to competing interactions.
- Understanding magnetic quantum phase transitions is crucial for materials science.
Purpose of the Study:
- To investigate the magnetic quantum phase transition in an anisotropic Kondo lattice model.
- To analyze the interplay between RKKY and Kondo interactions.
Main Methods:
- Utilized an extended dynamic mean field theory (DMFT) for both antiferromagnetic and paramagnetic phases.
- Employed quantum Monte Carlo (QMC) simulations to reach temperatures as low as 1% of the Kondo scale.
Main Results:
- Finite-temperature magnetic transitions are first-order for strong RKKY interactions.
- Extrapolated zero-temperature magnetic transitions are continuous and locally critical.
Conclusions:
- The study provides insights into the nature of magnetic transitions in anisotropic Kondo lattice systems.
- The findings contribute to the understanding of quantum criticality in correlated electron systems.
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