Investigation of the magnetic ground state of GaV${}_4$S${}_8$ using powder neutron diffraction

Abstract

The magnetic ground state of polycrystalline Néel skyrmion hosting material GaV${}_4$S${}_8$ has been investigated using ac susceptibility and powder neutron diffraction. In the absence of an applied magnetic field GaV${}_4$S${}_8$ undergoes a transition from a paramagnetic to a cycloidal state below 13~K and then to a ferromagnetic-like state below 6~K. With evidence from ac susceptibility and powder neutron diffraction, we have identified the commensurate magnetic structure at 1.5 K, with ordered magnetic moments of $0.23(2)\hat{I}{¼}_{\mathrm{B}}$ on the V1 sites and $0.22(1)\hat{I}{¼}_{\mathrm{B}}$ on the V2 sites. These moments have ferromagnetic-like alignment but with a 39(8)${}^{\circ }$ canting of the magnetic moments on the V2 sites away from the V${}_4$ cluster. 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.

9 pages, 4 figures