Field-induced spin density wave and spiral phases in a layered antiferromagnet

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

“…Intriguingly, thermodynamic and torque magnetometry measurements determined that the H-T phase diagram was more complex than expected for a single-Q BEC system, with two ordered phases I and II found for all field orientations except H c where only one ordered phase was uncovered [7,19]. Subsequent neutron diffraction measurements in a horizontal scattering plane with an applied field H a * identified phases I and II as an incommensurate spin spiral and spin density wave state respectively [20], but nuclear mag-netic resonance (NMR) work argued that the BEC description only holds for H c [21].…”