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(PO${}_4$)${}_2$. 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 novel spin state which emerges in high magnetic fields after antiferromagnetic order is terminated at $H_{c1}\simeq 4.0$ T. It is a distinct thermodynamic phase with a well-defined phase boundary at $H_{c2}\simeq 6.5$ T 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.

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Cited by in corpus (12)

• Where is the Quantum Spin Nematic?
• Magnetic phase diagram of the breathing-kagome antiferromagnet Nd${}_3$BWO${}_9$
• Pre-saturation phase in the frustrated ferro-antiferromagnet Pb${}_2$VO(PO${}_4$)${}_2$
• Deformed spin-$\frac{1}{2}$ square lattice in antiferromagnetic NaZnVOPO${}_4$(HPO${}_4$)
• NMR evidence against a spin-nematic nature of the presaturation phase in the frustrated magnet SrZnVO(PO4)2
• Inelastic neutron scattering determination of the spin Hamiltonian for BaCdVO(PO${}_4$)${}_2$
• Miniature capacitive Faraday force magnetometer for magnetization measurements at low temperatures and high magnetic fields
• Possible Observation of Quadrupole Waves in Spin Nematics
• Phase diagram and spin waves in the frustrated ferro-antiferromagnet SrZnVO(PO4)2
• Quasi two-dimensional magnetism in spin-$\frac{1}{2}$ square lattice compound Cu[C${}_6$H${}_2$(COO)${}_4$][H${}_3$N-(CH${}_2$)${}_2$-NH${}_3$]$\cdot$3H${}_2$O
• Spin correlations in the frustrated ferro-antiferromagnet SrZnVO(PO4)2 near saturation
• Narrowly avoided spin-nematic phase in BaCdVO(PO${}_4$)${}_2$: NMR evidence