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.

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

References in corpus (1)

• Ordering of the pyrochlore Ising model with the long-range RKKY interaction

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• Spin ordering induced by lattice distortions in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice
• Low-temperature magnetic properties of the Kondo lattice model in one dimension
• Metal-insulator transitions in pyrochlore oxides