Abstract
We use the three-dimensional Heisenberg model with site randomness as an effective model of the compound Sr(Fe1−xMnx)O2. 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-q ordered phase characterized by two wave numbers, (πππ) and (ππ0). We also identify the spin ordering pattern in the double-q ordered phase.
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