2019/08/22 by Kavita Mehlawat, Mehlawat, Kavita, Yogesh Singh +1
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.1908.08475
openalex publication_date 2019/08/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report discovery of a new iridate family KxIryO2 with depleted triangular lattice planes made up of edge sharing IrO6 octahedra separated by K planes. Such a material interpolates between the triangular and honeycomb lattices and is a new playground for Kitaev physics. The materials are Mott insulators with y = 1 - x/4. Physical property measurements for the x ≈ 0.85 material are reported. Using magnetic susceptibility χ versus temperature T measurements we find Seff = 1/2 moments interacting strongly with a Weiss temperature θ≈ - 180~K and no magnetic order or spin freezing down to T = 1.8~K\@. Heat capacity shows a broad maximum around 30~K which is insensitive to magnetic fields and a T-linear low temperature behaviour with γ∼ 10~mJ/mol~K2. These results are consistent with a gapless QSL state in K0.85Ir0.79O2.