Spin dynamics in Heisenberg triangular antiferromagnets: A muSR study of LiCrO2

Abstract

We report a muSR 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 inter-plane coupling in LiCrO2.

6 pages, 5 figures

References in corpus (8)

• Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
• Quantum magnetism in the paratacamite family: towards an ideal kagome lattice
• Direct Measurement of the Spin Hamiltonian and Observation of Condensation of Magnons in the 2D Frustrated Quantum Magnet Cs2CuCl4
• Triangular Antiferromagnets
• Unconventional Dynamics in Triangular Heisenberg Antiferromagnet NaCrO2
• Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet NiGa${}_2$S${}_4$ revealed by Ga-NMR, NQR and $\mu$SR measurements
• Vortex-induced topological transition of the bilinear-biquadratic Heisenberg antiferromagnet on the triangular lattice
• Electronic structure and magnetism in the frustrated antiferromagnet LiCrO2

Cited by in corpus (4)

• Z2-vortex order of frustrated Heisenberg antiferromagnets in two dimensions
• Magnetic transition and spin dynamics in the triangular Heisenberg antiferromagnet $\alpha$-KCrO${}_2$
• Spin-orbital magnetism in moiré Wigner molecules
• Universal fluctuating regime in triangular chromate antiferromagnets