Double-$\it q$ Order in a Frustrated Random Spin System

Details Double-$\it q$ Order in a Frustrated Random Spin System Double-$\it q$ Order in a Frustrated Random Spin System

2011-05-12

arxiv.org/abs/1105.2455v1

Journal of Physics: Conference Series, Vol. 320 pp. 012013 (2011)

Physics

Condensed Matter

Statistical Mechanics

5pages, 3figures

Scientific paper

10.1088/1742-6596/320/1/012013

We use the three-dimensional Heisenberg model with site randomness as an effective model of the compound Sr(Fe$_{1-x}$Mn$_x$)O$_2$. The model consists of two types of ions that correspond to Fe and Mn ions. The nearest-neighbor interactions in the ab-plane are antiferromagnetic. The nearest-neighbor interactions along the c-axis between Fe ions are assumed to be antiferromagnetic, whereas other interactions are assumed to be ferromagnetic. From Monte Carlo simulations, we confirm the existence of the double-$\boldsymbol{q}$ ordered phase characterized by two wave numbers, $(\pi\pi\pi)$ and $(\pi\pi0)$. We also identify the spin ordering pattern in the double-$\boldsymbol{q}$ ordered phase.

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