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We study the ground state and spin excitations in Ba3MnSb2O9, an easy-plane S= 5/2 triangular lattice antiferromagnet. By combining single-crystal neutronscattering, electric spin resonance (ESR), and spin wave calculations, wedetermine the frustrated quasi-two-dimensional spin Hamiltonian parametersdescribing the material. While the material has a slight monoclinic structuraldistortion, which could allow for isosceles-triangular exchanges and biaxialanisotropy by symmetry, we observe no deviation from the behavior expected forspin waves in the in-plane 120o state. Even the easy-plane anisotropy is sosmall that it can only be detected by ESR in our study. In conjunction with thequasi-two-dimensionality, our study establishes that Ba3MnSb2O9 is a nearlyideal triangular lattice antiferromagnet with the quasi-classical spin S = 5/2,which suggests that it has the potential for an experimental study of Z- orZ2-vortex excitations.

Static and dynamical properties of the spin-5/2 nearly ideal triangular lattice antiferromagnet Ba3MnSb2O9