DOE OSTI · 3002275
Spin-flop-like transition as quantum critical point in Cs2RuO4
Abstract
We report thermodynamic, neutron diffraction, and inelastic neutron scattering measurements on Cs2RuO4, a member of the celebrated family of frustrated magnets Cs2𝑀𝑋4 (𝑀 = Cu, Co, 𝑋 = Br, Cl). Unlike the previously studied members, it is based on 4𝑑 transition metal ions with 𝑆=1. Mapping out the 𝐻−𝑇 magnetic phase diagram reveals an unusual continuous spin-flop-like phase transition associated with a quantum critical point within the antiferromagnetically ordered phase. A quantitative analysis of the complex magnetic excitation spectrum measured in zero field allows us to derive a model magnetic Hamiltonian for this compound. Its main feature is a frustration of magnetic anisotropy on a level that is much higher than in any of the previously studied species. This frustration naturally explains the peculiar phase transition observed.
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Nabi, S [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland], Zhu, M [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland], povarov, Kirill [Dresden High Magnetic Field Laboratory], Mazzone, Daniel [Paul Scherrer Institut (PSI), Laboratory for Neutron Scattering, Switzerland], Lass, J [Paul Scherrer Institut (PSI), Laboratory for Neutron Scattering, Switzerland], Wu, Yan [ORNL] (ORCID:000000031566614X), Yan, Z [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland], S, Gvasaliya [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland], Zheludev, A [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland]. 2025-10-01. Spin-flop-like transition as quantum critical point in Cs2RuO4. https://doi.org/10.1103/bds5-vkvm
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