Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4
- Resource Type
- Working Paper
- Authors
- Weickert, Franziska; Aczel, Adam A.; Stone, Matthew B.; Garlea, V. Ovidiu; Dong, Chao; Kohama, Yoshimitsu; Movshovich, Roman; Demuer, Albin; Harrison, Neil; Gamza, Monika B.; Steppke, Alexander; Brando, Manuel; Rosner, Helge; Tsirlin, Alexander A.
- Source
- Phys. Rev. B 100, 104422 (2019)
- Subject
- Condensed Matter - Strongly Correlated Electrons
- Language
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.