2025/02/17 by Krieger, Jonas Andreas, Hicken, Thomas James, Luetkens, Hubertus +2
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Strongly Correlated Electrons (cond-mat.str-el)
paper · doi:10.48550/arxiv.2502.11841
The kapellasite family ACu3(OH)6+x(Cl,Br)3-x forms a series of compounds, wherein the chemical pressure realized by the A-site cation tunes the spin exchange in the frustrated distorted kagome lattice. Via hydrothermal synthesis we have grown single crystals of the whole series for A= rare-earths and found a clear structural transition to a superstructure variant at a specific chemical pressure level exerted by A~=~Dy. Phases with crystal structures in the vicinity of this superstructure transition realize a distorted kagome lattice of the Cu2+ cations with characteristic features of a spin liquid. Here, subtle structural disorder as well as controlled chemical pressure can stabilize the spin liquid phase. We study the crystal structure and the magnetic ground state of these phases via single crystal x-ray diffraction, magnetic susceptibility, specific heat and muon spin spectroscopy measurements.