Magnetic excitations in Na2IrO3
INS experiments on IN8 and Thales have been conducted on the Kitaev candidate material Na2IrO3, allowing to characterize the low energy AFM magnon dispersion and to determine the magnon gap. Looking at a Kitaev signature, no magnetic signal has been found at low energy at the 2D zone center and only a weakly dispersive feature has been found at 23meV. The understanding of the magnetic excitations requires a complex Hamiltonian, whose numerous exchange parameters cannot be unambiguously determined. So far, due to the large activation of the sample, only measurements in the (0kl) scattering plane have been conducted. We propose to continue investigating the magnetic excitations in Na2IrO3 with a different scattering plane, which will help not only to discriminate the large parameters sets, but also facilitate the interpretation of magnetic signals in both INS and RIXS measurements.
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BERTIN Alexandre; M. Braden; IVANOV Alexandre and PIOVANO Andrea. (2021). Magnetic excitations in Na2IrO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-841
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