Approaching the ground state of the kagome antiferromagnet
W. Schweika, M. Valldor, P. Lemmens
Abstract
Y0.5$Ca0.5BaCo4O7 contains kagome layers of Co ions, whose spins are strongly coupled according to a Curie-Weiss temperature of -2200 K. At low temperatures, T = 1.2 K, our diffuse neutron scattering study with polarization analysis reveals characteristic spin correlations close to a predicted two-dimensional coplanar ground state with staggered chirality. The absence of three dimensional long-range AF order proves negligible coupling between the kagome layers. The scattering intensities are consistent with high spin S=3/2 states of Co2+ in the kagome layers and low spin S=0 states for Co3+ ions at interlayer sites. Our observations agree with previous Monte Carlo simulations indicating a ground state of only short range chiral order.
Create a lesson
Related papers
Pseudospin Dynamics of Charge Order
Ping Tang
Holographic Representations of Topological Quantum Criticality: Emergent Symmetry Approach around the Bott Clock
Fan Yang, Fei Zhou
Symmetry-Enforced Topological Structures in Quantum Phase Diagrams
Linhao Li, Yuan Yao
Thermal Hall Signatures of Distinct Schwinger-Boson Flux Sectors on the Honeycomb Lattice
Daiki Sasamoto
Emergent Pair Density Wave and Incoherent Metallic State in a Strongly Correlated Doped System
Soham Maiti, Nandan Pakhira, A. Taraphder
Magnetic Field-Tunable Repulsive Exciton-Exciton Interaction in the van der Waals Antiferromagnet NiPS3
Kaiyang Huang, Jaena Park, Zhuo Yang et al.