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We present inelastic neutron scattering data on the quantum paramagnetAgVOAsO4 that establish the system is a S=1/2 alternating spin chain compoundand provide a direct measurement of the spin gap. We also present experimentalevidence for two different types of field-induced magnetic order betweenmu_0H_c1 = 8.4T and mu_0H_c2 = 48.9T, which may be related to Bose-Einsteincondensation (BEC) of triplons. Thermodynamic measurements in magnetic fieldsup to 60T and temperatures down to 0.1K reveal a H-T phase diagram consistingof a dome encapsulating two ordered phases with maximum ordering temperaturesof 3.8K and 5.3K respectively. This complex phase diagram is not expected for asingle-Q BEC system and therefore establishes AgVOAsO4 as a promising multi-QBEC candidate capable of hosting exotic vortex phases.

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