Magnetic Order and Charge Disproportionation in a Spin-ice type Kondo Lattice Model: Large Scale Monte Carlo Study

Abstract

Phase diagram of a spin-ice type Kondo lattice model, potentially relevant to metallic pyrochlore oxides, is obtained by the Monte Carlo simulation implementing the polynomial expansion technique up to the system size with 2048 sites. We identified a new 32-sublattice magnetic phase with concomitant charge disproportionation, along with other phases such as two-in two-out and all-in/all-out orders. The spin and charge pattern can be switched by external magnetic field to a different one accompanied by a half magnetization plateau.

arXiv comment5 pages, 3 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (4)

• Phase Separation in Electronic Models for Manganites
• A Monte Carlo Method for Fermion Systems Coupled with Classical Degrees of Freedom
• Non-Kondo mechanism for resistivity minimum in spin ice conduction systems
• Ordering of the pyrochlore Ising model with the long-range RKKY interaction

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• Theory of Multifarious Quantum Phases and Large Anomalous Hall effect in Pyrochlore Iridate Thin Films
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• A strong coupling theory for electron-mediated interactions in double-exchange models
• Monte Carlo Study of an Effective Ising Model for the Spin-ice type Kondo Lattice Model
• Polynomial Expansion Monte Carlo Study of Frustrated Itinerant Electron Systems: Application to a Spin-ice type Kondo Lattice Model on a Pyrochlore Lattice
• Phase Diagram of a Spin-ice Kondo Lattice Model in a Breathing Pyrochlore Lattice
• Metal-insulator transitions in pyrochlore oxides