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The Nature of Spin Excitations in the One-Third Magnetization Plateau Phase of Ba3CoSb2O9



Y. Kamiya, L. Ge, Tao Hong, Yiming Qiu, D. L. Quintero-Castro, Z. Lu, H. B. Cao, M. Matsuda, E. S. Choi, C. D. Batista, M. Mourigal, H. D. Zhou, J. Ma


A recent experiment revealed that the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9 is a magnetically ordered material with an anomalous excitation spectrum, comprising a high-intensity excitation continuum and short-lived magnons, which cannot be explained with spin wave theory [Ma et al., Phys. Rev. Lett. 116, 087201 (2016)]. We use neutron scattering measurements in high magnetic field to map the magnetic excitations of Ba3CoSb2O9 in its 1/3-magnetization plateau. This enables an investigation on the role of quantum fluctuations and the validity of a previously obtained effective spin Hamiltonian for this material. The measured excitation spectrum of the up-up-down phase induced by a magnetic field of ≥ 9.8 T is quantitatively explained by nonlinear spin wave theory. This agreement confirms the validity of the spin Hamiltonian, indicating that the anomalous zero-field spin dynamics has an intrinsic quantum mechanical origin.
Nature Communications


quantum spin liquid, neutron scattering


Kamiya, Y. , Ge, L. , Hong, T. , Qiu, Y. , Quintero-Castro, D. , Lu, Z. , Cao, H. , Matsuda, M. , Choi, E. , Batista, C. , Mourigal, M. , Zhou, H. and Ma, J. (2018), The Nature of Spin Excitations in the One-Third Magnetization Plateau Phase of Ba<sub>3</sub>CoSb<sub>2</sub>O<sub>9</sub>, Nature Communications, [online], (Accessed May 20, 2024)


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Created July 9, 2018, Updated October 12, 2021