Long-lived zone-boundary magnons in an antiferromagnet by Jeongheon Choe, David Lujan, Gaihua Ye, Cynthia Nnokwe, Bowen Ma, Jiaming He, Frank Y. Gao, T. Nathan Nunley, Aritz Leonardo, Mikel Arruabarrena, Andres Ayuela, Jianshi Zhou, Martin Rodriguez-Vega, Gregory A. Fiete, Rui He, Xiaoqin Li

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