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Spin Dynamics in the Skyrmion-Host Lacunar Spinel GaV4S8



G. Pokharel, H. Arachchige, S. Gao, S.-H. Do, R. Fishman, G. Ehlers, Yiming Qiu, Jose Rodriguez Rivera, M. B. Stone, H. Zhang, Stephen Wilson, D. Mandrus, A. Christianson


In the lacunar spinel GaV4S8, the interplay of spin, charge, and orbital degrees of freedom produces a rich phase diagram that includes an unusual Neel-type skyrmion phase composed of molecular spins. To provide ´ insight into the interactions underlying this complex phase diagram, we study the spin excitations in GaV4S8 through inelastic neutron scattering measurements on polycrystalline and single crystal samples. Using linear spin wave theory, we describe the spin wave excitations using a model where V4 clusters decorate an FCC lattice. The effective cluster model includes a ferromagnetic interaction and a weaker antisymmetric Dzyaloshinskii-Moriya (DM) interaction between the neighboring molecular spins. Our work clarifies the spin interactions in GaV4S8 and supports the picture of interacting molecular clusters
Physical Review B


skyrmion, lacunar spinel, spin Hamiltonian, inelastic neutron scattering


Pokharel, G. , Arachchige, H. , Gao, S. , Do, S. , Fishman, R. , Ehlers, G. , Qiu, Y. , Rodriguez Rivera, J. , Stone, M. , Zhang, H. , Wilson, S. , Mandrus, D. and Christianson, A. (2021), Spin Dynamics in the Skyrmion-Host Lacunar Spinel GaV<sub>4</sub>S<sub>8</sub>, Physical Review B (Accessed July 20, 2024)


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Created December 19, 2021, Updated November 29, 2022