Spin Dodecamer Formation in the Double-Exchange Spin Ice Model

Details Spin Dodecamer Formation in the Double-Exchange Spin Ice Model Spin Dodecamer Formation in the Double-Exchange Spin Ice Model

2004-06-16

arxiv.org/abs/cond-mat/0406366v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1143/JPSJ.73.1623

We investigated the double-exchange spin ice (DESI) model on a kagom\'e 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 kagom\'e 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.

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