2014/02/14 by Jaime Merino, Michael Holt, Ben J. Powell +1 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Antiferromagnetism #Boson #Condensed matter physics #Ferromagnetism #Heisenberg model #Inelastic neutron scattering #Magnon #Mean field theory #Neutron scattering #Organic and Molecular Conductors Research #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Scattering #Semiclassical physics #Spin (aerodynamics) #Spinon #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.89.245112
published as Phys. Rev. B 89, 245112 (2014) · 11 pages, 9 figures
arxiv created 2014/02/14 · openalex publication_date 2014/06/10 · arxiv updated 2014/06/18 · openalex created_date 2016/08/23 · openalex updated_date 2026/08/06
We explore the effect of the third-nearest neighbors on the magnetic properties of the Heisenberg model on an anisotropic triangular lattice. We obtain the phase diagram of the model using Schwinger boson mean-field theory. Competition between N'eel, spiral, and collinear magnetically ordered phases is found as we vary the ratios of the nearest J1, next-nearest J2, and third-nearest J3 neighbor exchange couplings. A spin-liquid phase is stabilized between the spiral and collinear ordered states when J2/J1\ensuremath\gtrsim1.8, for rather small J3/J1\ensuremath\lesssim0.1. The lowest-energy two-spinon dispersions relevant to neutron scattering experiments are analyzed and compared to semiclassical magnon dispersions finding significant differences in the spiral and collinear phases between the two approaches. The results are discussed in the context of the anisotropic triangular materials: Cs2CuCl4 and Cs2CuBr4 and layered organic materials, \ensuremathκ-(BEDT-TTF)2X, and Y[Pd(dmit)2]2.