Partial disorder in an Ising-spin Kondo lattice model on a triangular lattice

Abstract

Phase diagram of an Ising-spin Kondo lattice model on a triangular lattice near 1/3-filling is investigated by Monte Carlo simulation. We identify a partially disordered phase with coexistence of magnetic order and paramagnetic moments, which was unstable in two-dimensional Ising models with localized spins only. The partial disorder emerges in the competing regime between a twosublattice stripe phase and three-sublattice ferrimagnetic phase, at finite temperatures above an electronic phase separation. The peculiar magnetic structure accompanies a charge order and develops a gap in the electronic structure. The results manifest a crucial role of the nonperturbative interplay between spin and charge degrees of freedom in stabilizing the partial disorder.

5 pages, 4 figures, accepted for publication in Physical Review Letters

References in corpus (6)

• Phase Separation in Electronic Models for Manganites
• Partial Kondo screening in frustrated Kondo lattice systems
• Non-Kondo mechanism for resistivity minimum in spin ice conduction systems
• Ordered Phases and Phase Transitions in The Stacked Triangular Ising Antiferromagnet CsCoCl${}_3$ and CsCoBr${}_3$
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