4.6 Article

Investigating field-induced magnetic order in Han purple by neutron scattering up to 25.9 T

Journal

PHYSICAL REVIEW B
Volume 106, Issue 10, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.104418

Keywords

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Funding

  1. Swiss National Science Foundation
  2. ERC grant Hyper Quantum Criticality (HyperQC)
  3. Swiss Data Science Centre (SDSC) [GLADYS ANR-19-CE30-0013]
  4. French National Research Agency (ANR) [THERMOLOC ANR-16-CE30-0023-02, 2020-P0677, BISTOM C17-12, x2020050225]

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Researchers used the HFM/EXED instrument to investigate the properties of BaCuSi2O6 at a magnetic field of 25.9 T, revealing the nature of its magnetic ordered phase and its significance in studying quasi-2D physics arising from layered structures and different bilayer types.
BaCuSi2O6 is a quasi-two-dimensional (2D) quantum antiferromagnet containing three different types of stacked, square-lattice bilayer hosting spin-1/2 dimers. Although this compound has been studied extensively over the last two decades, the critical applied magnetic field required to close the dimer spin gap and induce magnetic order, which exceeds 23 T, has to date precluded any kind of neutron scattering investigation. However, the HFM/EXED instrument at the Helmholtz-Zentrum Berlin made this possible at magnetic fields up to 25.9 T. Thus we have used HFM/EXED to investigate the field-induced ordered phase, in particular to look for quasi-2D physics arising from the layered structure and from the different bilayer types. From neutron diffraction data, we determined the global dependence of the magnetic order parameter on both magnetic field and temperature, finding a form consistent with 3D quantum critical scaling; from this we deduce that the quasi-2D interactions and nonuniform layering of BaCuSi2O6 are not anisotropic enough to induce hallmarks of 2D physics. From neutron spectroscopy data, we measured the dispersion of the strongly Zeeman-split magnetic excitations, finding good agreement with the zero-field interaction parameters of BaCuSi2O6. We conclude that HFM/EXED allowed a significant extension in the application of neutron scattering techniques to the field range above 20 T and in particular opened previously unavailable possibilities in the study of field-induced magnetic quantum phase transitions.

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