Presaturation phase with no dipolar order in a quantum ferro-antiferromagnet
Abstract
Magnetization, magnetocaloric, calorimetric, neutron- and x-ray-diffraction, and inelastic-neutron-scattering measurements are performed on single crystals of BaCdVO(PO4)2. The low-temperature crystal structure is found to be of a lower symmetry than previously assumed. The result is a more complicated model spin Hamiltonian, which we infer from measurements of the spin wave dispersion spectrum. The main finding is a spin state which emerges in high magnetic fields after antiferromagnetic order is terminated at Hc1≃4.0T. It is a distinct thermodynamic phase with a well-defined phase boundary at Hc2≃6.5T and is clearly separate from the fully saturated phase, yet it shows no conventional (dipolar) magnetic long-range order. We argue that it is fully consistent with the expectations for a quantum bond-nematic state. Show more
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https://doi.org/10.3929/ethz-b-000392693Publication status
publishedExternal links
Journal / series
Physical Review ResearchVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03855 - Zheludev, Andrey / Zheludev, Andrey
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