Abstract The quantum dimer magnet, with antiferromagnetic intradimer and interdimer Heisenberg exchange between spin-1/2 moments, is known to host an (| -|) /2 (↑ ↓ − ↓ ↑) / 2 singlet ground state when the intradimer exchange is dominant. Rare-earth-based quantum dimer systems with strong spin-orbit coupling offer the opportunity for tuning their magnetic properties by using magnetic anisotropy as a control knob. Here, we present bulk characterization and neutron scattering measurements of the quantum dimer magnet Yb 2 Be 2 SiO 7. We find that the Yb 3+ ions can be described by an effective spin-1/2 model at low temperatures and the system does not show signs of magnetic order down to 50 mK. The magnetization, heat capacity, and neutron spectroscopy data can be well-described by an isolated dimer model with highly anisotropic exchange that stabilizes a singlet ground state with a wavefunction (| -|) /2 (↑ ↑ − ↓ ↓) / 2 or (| +|) /2 (↑ ↑ + ↓ ↓) / 2. Our results show that strong spin-orbit coupling can induce unusual entangled states of matter in quantum dimer magnets.
Brassington et al. (Wed,) studied this question.
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