Towards cubic symmetry for Ir4+ : Structure and magnetism of the antifluorite K2IrBr6

  title={Towards cubic symmetry for 
: Structure and magnetism of the antifluorite 
  author={N. Khan and D. A. Prishchenko and Mary H. Upton and Vladimir G. Mazurenko and Alexander A. Tsirlin},
  journal={Physical Review B},
Crystal structure, electronic state of ${\mathrm{Ir}}^{4+}$, and magnetic properties of the antifluorite compound ${\mathrm{K}}_{2}{\mathrm{IrBr}}_{6}$ are studied using high-resolution synchrotron x-ray diffraction, resonant inelastic x-ray scattering (RIXS), thermodynamic and transport measurements, and ab initio calculations. The crystal symmetry is reduced from cubic at room temperature to tetragonal below 170 K and eventually to monoclinic below 122 K. These changes are tracked by the… 
Antiferromagnetic resonance in the cubic iridium hexahalides (NH4)2IrCl6 and K2IrCl6
L. Bhaskaran, ∗ A. N. Ponomaryov, † J. Wosnitza, 2 N. Khan, A. A. Tsirlin, M. E. Zhitomirsky, and S. A. Zvyagin ‡ Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of
Quantum materials with strong spin–orbit coupling: challenges and opportunities for materials chemists
The physics of materials with strong spin–orbit coupling is currently highly topical. Here we present an accessible outline of the chemistry of these materials, issues in determining their


Phase transition at 434 K
  • independent strain coupling in second transition at 400 K, and thermal expansivity in ferroelastic K2TeBr6, J. Chem. Phys. 81, 2082
  • 1984
and W
  • F. Peck Jr., Neutron powder diffraction study of the crystal structures of Sr2RuO4 and Sr2IrO4 at room temperature and at 10 K, J. Solid State Chem. 112, 355
  • 1994
Thermodynamical properties of K2OsCl6 and K2ReCl6 at low temperatures and near their structural phase transitions
  • Phys. Rev. B 15, 382
  • 1977
Cubic symmetry and magnetic frustration on the fcc spin lattice in K2IrCl6
Cubic crystal structure and regular octahedral environment of Ir$^{4+}$ render antifluorite-type K$_2$IrCl$_6$ a model fcc antiferromagnet with a combination of Heisenberg and Kitaev exchange
Revisiting the Kitaev material candidacy of Ir 4 + double perovskite iridates
Kitaev materials, based on bond-directional Ising interactions, offer an intriguing platform for hosting exotic magnetic ground states and excitations. Significant Kitaev interactions are most
Quantum versus thermal fluctuations in the fcc antiferromagnet: Alternative routes to order by disorder
In frustrated magnetic systems with competing interactions fluctuations can lift the residual accidental degeneracy. We argue that the state selection may have different outcomes for quantum and
  • electronic, and magnetic properties of nearly ideal Jeff = 1 2 iridium halides, Phys. Rev. Materials 4, 124407
  • 2020
Structural, electronic, and magnetic properties of nearly ideal Jeff=12 iridium halides
Heavy transition metal magnets with $J_{\rm eff}$ $=$ 1/2 electronic ground states have attracted recent interest due to their penchant for hosting new classes of quantum spin liquids and