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

Weickert, Franziska, Aczel, Adam A., Stone, Matthew B., Garlea, V. Ovidiu, Kohama, Yoshimitsu, Movshovich, Roman, Demuer, Albin, Harrison, Neil, Gamza, Monika orcid iconORCID: 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 B, 100 (104422). ISSN 2469-9950

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Official URL: https://doi.org/10.1103/PhysRevB.100.104422

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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