High-field magnetic structure of the triangular antiferromagnet RbFe(MoO4)2

Abstract

The magnetic H - T phase diagram of a quasi-two-dimensional antiferromagnet RbFe(MoO4)2 with an equilateral triangular lattice structure is studied with 87Rb NMR and neutron diffraction techniques. This combination of experimental techniques allows us to determine the ordered components of the magnetic moments on the Fe3+ ions within various high-field phases - the Y, UUD, V, and fan structures, stabilized in the compound by the in-plane magnetic field. It is also established that the transition from the V to the fan phase is of first-order, whereas the transition from the fan phase to the polarized paramagnetic phase is continuous. An analysis of the NMR spectra shows that the high-field fan phase of RbFe(MoO4)2 can be successfully described by a periodic commensurate oscillation of the magnetic moments around the field direction in each Fe layer combined with an incommensurate modulation of the magnetic structure perpendicular to the layers.

arXiv comment13 pages, 15 figures

References in corpus (11)

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Cited by in corpus (4)

• Magnetic phase diagram of a 2-dimensional triangular lattice antiferromagnet Na${}_2$BaMn(PO${}_4$)${}_2$
• Spin structures and phase diagrams of the spin-$\frac{5}{2}$ triangular-lattice antiferromagnet Na${}_2$BaMn(PO${}_4$)${}_2$ under magnetic field
• Anisotropy stabilized magnetic phases of the triangular antiferromagnet RbFe(MoO${}_4$)${}_2$
• Field-induced transitions from incommensurate to commensurate phases in helical antiferromagnets