Spin Dodecamer Formation in the Double-Exchange Spin Ice Model

Abstract

We investigated the double-exchange spin ice (DESI) model on a kagomé lattice by Monte Carlo simulation to study the effects of a geometrical frustration, and the mechanism that generates an ordered state in a metallic system. The DESI model on the kagomé lattice is a frustrated metallic system due to an effective ferromagnetic interaction between localized spins caused by the double-exchange (DE) mechanism and a uniaxial anisotropy for the localized spins. A dodecagonal spin cluster (named dodecamer), which consists of twelve localized spins, appears at low temperature when the number of particles per site $n\simeq 1/3\sim 1/2$. Such a dodecamer order is driven by both the kinetic energy gain due to the DE mechanism and the geometrical frustration. We discuss that cluster orders, in general, may be a common feature in itinerant electron systems coupled with frustrated adiabatic fields.

9 pages, 6 figures, to be published in J. Phys. Soc. Jpn

References in corpus (5)

• Phase Separation in Electronic Models for Manganites
• Dipolar Interactions and Origin of Spin Ice in Ising Pyrochlore Magnets
• Spin Correlations in Ho${}_2$Ti${}_2$O${}_7$: a Dipolar Spin Ice System
• Long Range Order at Low Temperature in Dipolar Spin Ice
• Critical Phenomena of Ferromagnetic Transition in Double-Exchange Systems

Cited by in corpus (6)

• Spontaneous Spatial Inversion Symmetry Breaking and Spin Hall Effect in a Spin-ice Double-exchange Model on a Pyrochlore Lattice
• Spin Singlet State in Heptamers Emerging in Spinel Oxide AlV${}_2$O${}_4$
• Metal-insulator transition caused by the coupling to localized charge-frustrated systems under ice-rule local constraint
• Frustration-induced Dodecamer Ordering in the Double-Exchange Spin Ice Model on the Kagomé Lattice
• Non-Degenerate Ground State in the Antiferromagnetic Double-Exchange Model on a Triangular Lattice
• Mechanism for lifting the degeneracy in the double-exchange spin ice model on a kagomé lattice: Dodecamer formation