2002/10/11 by L. E. Svistov, A. I. Smirnov, Alex I. Smirnov +4 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Chemistry #Condensed matter physics #Heisenberg model #Hexagonal lattice #Magnetic field #Magnetization #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Solid-state spectroscopy and crystallography #Spins #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.67.094434
9 pages incl 11 figures
arxiv created 2002/10/11 · openalex publication_date 2003/03/31 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
RbFe(MoO4)2 is a rare example of a nearly two-dimensional Heisenberg antiferromagnet on a triangular lattice. Magnetic resonance spectra and magnetization curves reveal that the system has a layered spin structure with six magnetic sublattices. The sublattices within a layer are arranged in a triangular manner with the magnetization vectors 120\ifmmode^∘\else\textdegree\fi apart. The H\ensuremath-T phase diagram, containing at least five different magnetic phases is constructed. In zero field, RbFe(MoO4)2 undergoes a phase transition at TN=3.8K into a noncollinear triangular spin structure with all the spins confined in the basal plane. The application of an in-plane magnetic field induces a collinear spin state between the fields Hc1=47kOe and Hc2=71kOe and produces a magnetization plateau at one-third of the saturation moment. Both the ESR and the magnetization measurements also clearly indicate an additional first-order phase transition in a field of 35 kOe. The exact nature of this phase transition is uncertain.