2016/07/08 by Changle Liu, Xiaoqun Wang, Rong Yu · 50 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Algorithm #Computer science #Magnetic and transport properties of perovskites and related materials #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.94.174424
published in Physical review. B./Physical review. B 94(17) (American Physical Society) · 11 pages, 5 figures
arxiv created 2016/07/08 · openalex created_date 2016/07/22 · openalex publication_date 2016/11/15 · arxiv updated 2016/11/17 · openalex updated_date 2026/08/05
Motivated by recent experiments on the frustrated quantum magnetic compound YbMgGaO4, we study an effective spin model on triangular lattice taking into account the effects of the spin-orbit coupling. We determine the classical ground-state phase diagram of this model, which includes a 120^\ensuremath∘ N'eel and two collinear antiferromagnetic phases. In the vicinity of the phase boundary between the N'eel and collinear phases, we identify three intermediate noncollinear antiferromagnetic phases. In each of them the magnetic moments are ordered at multiple incommensurate wave vector Q values. We further study the effects of quantum fluctuations in this model via a linear spin-wave theory. We find that the spin excitation gap of the noncollinear multi-Q antiferromagnetic states is vanishingly small. We also find that multi-Q states are most fragile against quantum fluctuations, and hence most unstable toward spin liquid phases.