Stabilization of the collinear plateau phase by thermal fluctuations in the disordered triangular lattice antiferromagnet Rb${}_{(1-x)}$K${}_x$Fe(MoO${}_4$)${}_2$

V. N. Glazkov, I. A. Krastilevskiy

The triangular lattice antiferromagnet RbFe(MoO${}_4$)${}_2$ orders antiferromagnetically in a planar 120${}^{\circ }$-structure below $T_{\text{N}}\approx 4$ K. A striking feature of RbFe(…