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Weickert, Franziska, Aczel, Adam A., Stone, Matthew B., Garlea, V. Ovidiu, Kohama, Yoshimitsu, Movshovich, Roman, Demuer, Albin, Harrison, Neil, Gamza, Monika 
ORCID: 0000-0003-3360-4006 et al
(2019)
Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4.
Physical Review X
.
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Official URL: https://arxiv.org/abs/1902.04633
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 μ0Hc1= 8.4 T and μ0Hc2=48.9 T, which may be related to Bose-Einstein condensation (BEC) of triplons. Thermodynamic measurements in magnetic fields up to 60 T and temperatures down to 0.1 K reveal a H−T phase diagram consisting of a dome encapsulating two ordered phases with maximum ordering temperatures of 3.8 K and 5.3 K 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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