Kagome lattice decorated with S=1/2 spins is one of the most discussed ways to realize a quantum spin liquid. However, all previous material realizations of this model have suffered from additional complications, ranging from additional interactions to impurity effects. Recently, a new quantum kagome system has been identified in the form of averievite Cu(5-x)ZnxV2O10(CsCl), featuring a unique double-layer spacing between the kagome planes. Using muon spin spectroscopy we show that only a complete substitution (i.e. x=2) of interplanar copper ions leads to a quantum-disordered ground state. In contrast, the parent compound (x=0) exhibits long-range magnetic order, with a phase transition around 24 K. Experiments performed on the partially substituted material (x=1) show that the transformation proceeds through an intermediate disordered, partially frozen ground state, unaffected by pressures up to 23 kbar. Our study provides a microscopic view of the magnetism of the decoupling of the kagome layers and establishes the averievite as a new material platform for the experimental study of the fully-decoupled kagome layers.
@article{arxiv.2504.20871,
title = {Fluctuating magnetism in Zn-doped averievite with well-separated kagome layers},
author = {G. Simutis and L. Suárez-García and H. Zeroual and I. Villa and M. Georgopoulou and D. Boldrin and C. N. Wang and C. Baines and T. Shiroka and R. Khasanov and H. Luetkens and B. Fåk and Y. Sassa and M. Bartkowiak and A. S. Wills and E. Kermarrec and F. Bert and P. Mendels},
journal= {arXiv preprint arXiv:2504.20871},
year = {2025}
}