Anomalous Spin Dynamics observed by High Frequency ESR in Honeycomb Lattice Antiferromagnet InCu2/3V1/3O3

Abstract

High-frequency ESR results on the S=1/2 Heisenberg hexagonal antiferromagnet InCu2/3V1/3O3 are reported. This compound appears to be a rare model substance for the honeycomb lattice antiferromagnet with very weak interlayer couplings. The high-temperature magnetic susceptibility can be interpreted by the S=1/2 honeycomb lattice antiferromagnet, and it shows a magnetic-order-like anomaly at TN=38 K. Although, the resonance field of our high-frequency ESR shows the typical behavior of the antiferromagnetic resonance, the linewidth of our high-frequency ESR continues to increase below TN, while it tends to decrease as the temperature in a conventional three-dimensional antiferromagnet decreases. In general, a honeycomb lattice antiferromagnet is expected to show a simple antiferromagnetic order similar to that of a square lattice antiferromagnet theoretically because both antiferromagnets are bipartite lattices. However, we suggest that the observed anomalous spin dynamics below TN is the peculiar feature of the honeycomb lattice antiferromagnet that is not observed in the square lattice antiferromagnet.

5 pages, 5 figures

References in corpus (3)

• An investigation of the quantum $J_1-J_2-J_3$ model on the honeycomb lattice
• Nonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry
• Spin-gap phase of a quantum spin system on a honeycomb lattice

Cited by in corpus (6)

• Anisotropy governed competition of magnetic phases in the honeycomb quantum magnet Na${}_3$Ni${}_2$SbO${}_6$ studied by dilatometry and high-frequency ESR
• Static and Dynamic Magnetic Response of Fragmented Haldane-like Spin Chains in Layered Li3Cu2SbO6
• Frustrated Heisenberg antiferromagnet on the honeycomb lattice: Spin gap and low-energy parameters
• Ground state and low-temperature magnetism of the quasi-two-dimensional honeycomb compound InCu${}_{2/3}$V${}_{1/3}$O${}_3$
• The decisive role of magnetic anisotropy in honeycomb layered Li${}_3$Ni${}_2$SbO${}_6$ and Na${}_3$Ni${}_2$SbO${}_6$
• Interplay of electron correlations, spin-orbit couplings, and structural effects for Cu centers in the quasi-two-dimensional magnet InCu${}_{2/3}$V${}_{1/3}$O${}_3$