A codimension-two spiral spin-liquid is a correlated paramagnetic state with one-dimensional ground state degeneracy hosted within a three-dimensional lattice. Here, via neutron scattering experiments and numerical simulations, we establish the existence of a codimension-two spiral spin-liquid in the effective honeycomb-lattice compound Cs3Fe2Cl9, which demonstrates a novel path to spiral spin-liquids by overcoming the long-standing impediment of weak further-neighbor interactions. In the long-range ordered regime, competing spiral and spin density wave orders emerge as a function of applied magnetic field, among which a possible order-by-disorder transition is identified.
@article{arxiv.2405.18973,
title = {Codimension-Two Spiral Spin-Liquid in the Effective Honeycomb-Lattice Compound Cs$_3$Fe$_2$Cl$_9$},
author = {Shang Gao and Chris Pasco and Otkur Omar and Qiang Zhang and Daniel M. Pajerowski and Feng Ye and Matthias Frontzek and Andrew F. May and Matthew B. Stone and Andrew D. Christianson},
journal= {arXiv preprint arXiv:2405.18973},
year = {2026}
}
Comments
21 pages, 19 figures, improved analysis of the INS spectra