Investigation of the magnetic ground state of GaV4S8using powder neutron diffraction.

The magnetic ground state of polycrystalline Néel skyrmion hosting material GaV4S8has been investigated usingacsusceptibility and powder neutron diffraction. In the absence of an applied magnetic field GaV4S8undergoes a transition from a paramagnetic to a cycloidal state below 13 K and then to a ferromagnetic-like state below 6 K. With evidence fromacsusceptibility and powder neutron diffraction, we have identified the commensurate magnetic structure at 1.5 K, with ordered magnetic moments of 0.23(2) μBon the V1 sites and 0.22(1) μBon the V2 sites. These moments have ferromagnetic-like alignment but with a 39(8)° canting of the magnetic moments on the V2 sites away from the V4cluster. In the incommensurate magnetic phase that exists between 6 and 13 K, we provide a thorough and careful analysis of the cycloidal magnetic structure exhibited by this material using powder neutron diffraction.