An anisotropic spin model of strong spin-orbit-coupled triangular antiferromagnets
Yao-Dong Li, Xiaoqun Wang, Gang Chen
TL;DR
This paper investigates a highly anisotropic spin model for strong spin-orbit-coupled triangular antiferromagnets, revealing complex phase behavior, quantum fluctuation effects, and magnetic excitations relevant to several experimental materials.
Contribution
It introduces a detailed analysis of an anisotropic spin Hamiltonian using classical and quantum methods, highlighting the suppression of magnetic order due to frustration and quantum fluctuations.
Findings
Classical phase diagram includes 120-degree and stripe phases.
Quantum fluctuations melt magnetic order in frustrated regions.
Magnetic excitations characterized in various phases and magnetic fields.
Abstract
Motivated by the recent experimental progress on the strong spin-orbit-coupled rare earth triangular antiferromagnet, we analyze the highly anisotropic spin model that describes the interaction between the spin-orbit-entangled Kramers' doublet local moments on the triangular lattice. We apply the Luttinger-Tisza method, the classical Monte Carlo simulation, and the self-consistent spin wave theory to analyze the anisotropic spin Hamiltonian. The classical phase diagram includes the 120-degree state and two distinct stripe ordered phases. The frustration is very strong and significantly suppresses the ordering temperature in the regimes close to the phase boundary between two ordered phases. Going beyond the semiclassical analysis, we include the quantum fluctuations of the spin moments within a self-consistent Dyson-Maleev spin-wave treatment. We find that the strong quantum…
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