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Static and Dynamical Properties of the Spin-1/2Equilateral Triangular-Lattice AntiferromagnetBa3CoSb2O9
2016
Physical Review Letters
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We present single-crystal neutron scattering measurements of the spin-1/2 equilateral triangular lattice antiferromagnet Ba_3CoSb_2O_9. Besides confirming that the Co^2+ magnetic moments lie in the ab plane for zero magnetic field, we determine all the exchange parameters of the minimal quasi-2D spin Hamiltonian, which confirms that Ba_3CoSb_2O_9 is an almost perfect realization of the paradigmatic model of frustrated quantum magnetism. A comparison with linear and nonlinear spin-wave theory
doi:10.1103/physrevlett.116.087201
pmid:26967439
fatcat:rqhbqdecdvdcdgqagteeyreqiu