RIXS studies of the low-energy magnetic excitations in double perovskite iridates La<sub>2</sub><i>B</i>IrO<sub>6</sub> (<i>B</i>=Co, Ni, Zn)
ORAL
Abstract
Ordered double perovskite (DP) materials [1-3], A2BB'O6, where B is a 3d and B' is a 4d or 5d transition metal ion, respectively, provide a rare opportunity to study the interaction between the intriguing magnetic behaviors of 5d systems and the better understood 3d magnetism, which is important for developing potential applications of these novel magnetic systems. Using resonant inelastic x-ray scattering (RIXS) measurements at Ir L3 edge, we have investigated the low-energy magnetic excitations in a series of La2BIrO6 single crystals, where B is Co, Ni and Zn, respectively. In La2CoIrO6 and La2NiIrO6, clear magnetic excitations with a large magnon gap ~ 40 meV were revealed, indicating an extremely large magnetic anisotropy in the magnetic interaction in these two compounds containing magnetic 3d ions. In contrast, the low energy magnon mode was absent in La2ZnIrO6 in which the 3d ions are non-magnetic, suggesting the importance of 3d-5d hybridization in the magnetic properties of DP iridates.
[1] K. Kobayashi, et al., Nature 395, 677 (1998).
[2] A. Aczel, et al., Phys. Rev. B 93, 214426 (2016).
[3] A. Kolchinskaya, et al., Phys. Rev. B 85, 224422 (2012).
[1] K. Kobayashi, et al., Nature 395, 677 (1998).
[2] A. Aczel, et al., Phys. Rev. B 93, 214426 (2016).
[3] A. Kolchinskaya, et al., Phys. Rev. B 85, 224422 (2012).
*This work is supported by Natural Science and Engineering Research Council of Canada through Discovery Grant and CREATE program.
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Presenters
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Wentao Jin
- Department of Physics, University of Toronto, Canada