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Successive Phase Transitions and Extended Spin-Excitation Continuum in the S=1⁄2 Triangular-Lattice Antiferromagnet Ba3CoSb2)9



H. D. Zhou, Cenke Xu, A. M. Hallas, H. J. Silverstein, C. R. Wiebe, I. Umegaki, J. Q. Yan, T. P. Murphy, J.-H. Park, Yiming Qiu, John R. Copley, Jason S. Gardner, Y. Takano


Using magnetic, thermal and neutron measurements on single-crystal samples, we show that Ba3CoSb2O9 is a spin-1/2 triangular-lattice antiferromagnet with easy-axis anisotropy and two magnetic phase transitions bracketing an intermediate up-up-down phase in magnetic field applied along the c axis. A pronounced, extensive neutron-scattering continuum above spin-wave excitations, observed below TN, implies that the system is in close proximity to one of two spin-liquid states that have been predicted for a 2D triangular lattice.
Physical Review Letters


triangular antiferromagnet, neutron scattering


Zhou, H. , Xu, C. , Hallas, A. , Silverstein, H. , Wiebe, C. , Umegaki, I. , Yan, J. , Murphy, T. , Park, J. , Qiu, Y. , Copley, J. , Gardner, J. and Takano, Y. (2012), Successive Phase Transitions and Extended Spin-Excitation Continuum in the S=1&#8260;2 Triangular-Lattice Antiferromagnet Ba<sub>3</sub>CoSb<sub>2</sub>)<sub>9</sub>, Physical Review Letters, [online], (Accessed June 17, 2024)


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Created December 25, 2012, Updated October 12, 2021