Article Dans Une Revue Physical Review Letters Année : 2024

Spin Waves and Three Dimensionality in the High-Pressure Antiferromagnetic Phase of SrCu2(BO3)2

Ellen Fogh
Mohamed E Zayed
Andrea Piovano
Martin Boehm
Paul Steffens
Irina Safiulina
Ursula B Hansen
Ekaterina Pomjakushina

Résumé

Quantum magnetic materials can provide explicit realizations of paradigm models in quantum many-body physics. In this context, SrCu2(BO3)2 is a faithful realization of the Shastry-Sutherland model (SSM) for ideally frustrated spin dimers, even displaying several of its quantum magnetic phases as a function of pressure. We perform inelastic neutron scattering (INS) measurements on SrCu2(BO3)2 at 5.5 GPa and 4.5 K, observing spin waves that characterize the high-pressure antiferromagnetic phase. The experimental spectra are well described by linear spin-wave calculations on a SSM with an inter-layer interaction, which is determined accurately as Jc = 0.053(3) meV. The presence of Jc indicates the need to account for the three-dimensional nature of SrCu2(BO3)2 in theoretical models, also at lower pressures. We find that the ratio between in-plane interactions, J'/J = 1.8(2), undergoes a dramatic change compared to lower pressures that we deduce is driven by a sharp drop in the dimer coupling, J. Our results underline the wide horizons opened by high-pressure INS experiments on quantum magnetic materials.
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Dates et versions

hal-04955936 , version 1 (19-02-2025)

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Ellen Fogh, Gaétan Giriat, Mohamed E Zayed, Andrea Piovano, Martin Boehm, et al.. Spin Waves and Three Dimensionality in the High-Pressure Antiferromagnetic Phase of SrCu2(BO3)2. Physical Review Letters, 2024, 133 (24), pp.246702. ⟨10.1103/PhysRevLett.133.246702⟩. ⟨hal-04955936⟩
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