Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet.

ABSTRACT: The S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic example of frustrated quantum magnetism. An ongoing challenge involves understanding the influence of exchange anisotropy on the collective behavior within such systems. Using inelastic neutron scattering (INS) and advanced calculation techniques, we have studied the low and high-temperature spin dynamics of Ba₂La₂CoTe₂O₁₂ (BLCTO): a Co²⁺-based J_eff = 1/2 TLAF that exhibits 120° order below T_N = 3.26 K. We determined the spin Hamiltonian by fitting the energy-resolved paramagnetic excitations measured at T > T_N, revealing exceptionally strong easy-plane XXZ anisotropy. Below T_N, the excitation spectrum exhibits a high ene

SUBMITTER: Park P 

PROVIDER: S-EPMC11343754 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature