Chemical tuning between triangular and honeycomb structures in a 5$d$ spin-orbit Mott insulator
(2019)
A series of magnon crystals appearing under ultrahigh magnetic fields in a kagom茅 antiferromagnet
ArXiv 1903.07283 (2019)
A series of magnon crystals appearing under ultrahigh magnetic fields in a kagom茅 antiferromagnet
Nature Communications Springer Nature 10:1 (2019) 1229
Chemical tuning between triangular and honeycomb structures in a 5d spin-orbit Mott insulator
University of Oxford (2019)
Abstract:
the deposited package contains resistivity and x-ray diffraction data on the layered potassium-iridate materials KxIryO2 We report structural studies of the spin-orbit Mott insulator family KxIryO2, with triangular layers of edge-sharing IrO6 octahedra bonded by potassium ions. The potassium content acts as a chemical tuning parameter to control the amount of charge in the Ir-O layers. Unlike the isostructural families with Ir replaced by Co or Rh (y=1), which are metallic over a range of potassium compositions x, we instead find insulating behaviour with charge neutrality achieved via iridium vacancies, which order in a honeycomb supercell above a critical composition. By performing density functional theory calculations we attribute the observed behaviour to a subtle interplay of crystal-field environment, local electronic correlations and strong spin-orbit interaction at the Ir4+ sites, making this structural family a candidate to display Kitaev magnetism in the experimentally unexplored regime that interpolates between triangular and honeycomb structures.Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet alpha-Li2IrO3
University of Oxford (2019)