Spin dynamics in Heisenberg triangular antiferromagnets: a &lt;em&gt;μ&lt;/em&gt;SR study of LiCrO&lt;sub&gt;2&lt;/sub&gt;

Olariu, A.; Mendels, P.; Bert, F.; Alexander, L.K.; Mahajan, A.V.; Hillier, A.D.; Amato, A.

doi:10.1103/PhysRevB.79.224401

Spin dynamics in Heisenberg triangular antiferromagnets: a μSR study of LiCrO₂

Olariu A, Mendels P, Bert F, Alexander LK, Mahajan AV, Hillier AD & Amato A

Citation

Olariu, A., Mendels, P., Bert, F., Alexander, L. K., Mahajan, A. V., Hillier, A. D., & Amato, A. (2009). Spin dynamics in Heisenberg triangular antiferromagnets: a μSR study of LiCrO₂. Physical Review B, 79(22), 224401 (5 pp.). https://doi.org/10.1103/PhysRevB.79.224401

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:17382

We report a μSR study of LiCrO₂, which has a magnetic lattice made up of a stacking of triangular Heisenberg antiferromagnetic (Cr³⁺, S=3/2) layers. A static magnetically ordered state is observed below the transition temperature T_N=62 K, while the expected peak of the relaxation rate is slightly shifted downward by a few kelvins below T_N. We draw a comparison with the isostructural compound NaCrO₂, where an exotic broad fluctuating regime has been observed [A. Olariu, P. Mendels, F. Bert, B. G. Ueland, P. Schiffer, R. F. Berger, and R. J. Cava, Phys. Rev. Lett. 97, 167203 (2006)] and was suggested to originate from topological excitations of the triangular lattice. Replacing Na by Li strongly narrows the exotic fluctuating regime formerly observed in NaCrO₂, which we attribute to a more pronounced interplane coupling in LiCrO₂.