Anisotropy stabilized magnetic phases of the triangular antiferromagnet RbFe(MoO${}_4$)${}_2$

Abstract

The magnetic H - T phase diagram of a quasi-two-dimensional easy plane antiferromagnet RbFe(MoO${}_4$)${}_2$ (S = 5/2) with an equilateral triangular lattice structure is studied with ${}^{87}$Rb NMR technique for field directed along hard axis C3. The studies confirm the two step transition from the low field umbrella-like incommensurate magnetic phase to the paramagnetic state observed recently (Mitamura et al. 2016). The transitions were identified as a lambda anomaly in the spin-lattice relaxation rate and a step increase of magnetic susceptibility at intermediate transition. The ${}^{87}$Rb NMR study precludes the possibility of either V or fan spin textures in the X phase. The additional transition is presumably associated with loss of inter plane magnetic order before the transition to paramagnetic state of individual triangular planes.

7 pages, 7 figures. arXiv admin note: substantial text overlap with arXiv:2112.06182

References in corpus (4)

• Direct transition from a disordered to a multiferroic phase on a triangular lattice
• Magnetic phase diagram, critical behaviour and 2D-3D crossover in a triangular lattice antiferromagnet RbFe(MoO4)2
• First-principles study of multiferroic RbFe(MoO${}_4$)${}_2$
• High-field magnetic structure of the triangular antiferromagnet RbFe(MoO4)2