We have synthesized single-crystal samples of β-VOSO4 and fully characterized their magnetic properties. Our magnetic susceptibility, high field magnetization and powder inelastic neutron scattering results are in excellent agreement with theoretical expressions for a one-dimensional spin-1/2 Heisenberg chain with an exchange parameter of 3.83(2) meV. Ab initio calculations identify the superexchange pathway, revealing that the spin-chain does not run along the expected crystallographic chain a direction but instead between V4+O6 octahedra that are linked via SO4 tetrahedra along the b axis. We do not detect any phase transition to a long-range magnetic order within our experimental conditions, indicating β-VOSO4 is very close to an ideal one-dimensional magnetic system.
@article{arxiv.2212.08473,
title = {One-dimensional magnetism in synthetic Pauflerite, $\beta$-VOSO$_4$},
author = {Diana Lucia Quintero-Castro and Gøran J. Nilsen and Katrin Meier-Kirchner and Angelica Benitez-Castro and Gerrit Guenther and Toshiro Sakakibara and Masashi Tokunaga and Chidozie Agu and Ipsita Mandal and Alexander A. Tsirlin},
journal= {arXiv preprint arXiv:2212.08473},
year = {2023}
}