On the Multi-q Characteristics of Magnetic Ground States of Honeycomb Cobalt Oxides

  • Abstract The Kitaev honeycomb model has received significant attention due to its exactly solvable quantum spin liquid ground states and fractionalized excitations. Layered cobalt oxides have been considered as a promising platform for realizing this model. However, in contrast to the conventional wisdom regarding the single-q zigzag magnetic order inferred from previous studies of the candidate materials Na2IrO3 and α-RuCl3, recent experiments on two representative honeycomb cobalt oxides, hexagonal Na2Co2TeO6 and monoclinic Na3Co2SbO6, have uncovered evidence for more complex multi-q zigzag order variants. This review surveys the experimental strategies used to distinguish between single- and multi-q orders, along with the crystallographic symmetries of cobalt oxides, in comparison with previously studied systems. The general formation mechanism of multi-q order is also briefly discussed. The goal is to provide a solid ground for examining the relevance of multi-q order in honeycomb cobalt oxides and discuss its implications for the microscopic model of these intriguing quantum magnets.
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