Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4

Abstract

We present inelastic neutron scattering data on the quantum paramagnet AgVOAsO4 that establish the system is a S=1/2 alternating spin chain compound and provide a direct measurement of the spin gap. We also present experimental evidence for two different types of field-induced magnetic order between mu_0H_c1 = 8.4T and mu_0H_c2 = 48.9T, which may be related to Bose-Einstein condensation (BEC) of triplons. Thermodynamic measurements in magnetic fields up to 60T and temperatures down to 0.1K reveal a H-T phase diagram consisting of a dome encapsulating two ordered phases with maximum ordering temperatures of 3.8K and 5.3K respectively. This complex phase diagram is not expected for a single-Q BEC system and therefore establishes AgVOAsO4 as a promising multi-Q BEC candidate capable of hosting exotic vortex phases.

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Cited by in corpus (8)

• Quasi-one-dimensional magnetism in the spin-$\frac{1}{2}$ antiferromagnet BaNa${}_2$Cu(VO${}_4$)${}_2$
• Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-$1/2$ antiferromagnet NaVOPO${}_4$
• Revealing three-dimensional quantum criticality by Sr-substitution in Han Purple
• Two types of alternating spin-$\frac{1}{2}$ chains and their field-induced transitions in $\epsilon$-LiVOPO${}_4$
• One-dimensional magnetism in synthetic Pauflerite, $\beta$-VOSO${}_4$
• Quantum magnetism of ferromagnetic spin dimers in $\alpha$-KVOPO${}_4$
• Magnetocaloric effect measurements in ultrahigh magnetic fields up to 120 T
• Inter-chain Interactions, Multi-magnon condensation and Strain effect in chain compound NaVOPO${}_4$