Excitations in the Magnetic Phases of the Molecular Magnet GaV4S8
In the molecular magnet GaV4S8 a Jahn-Teller instability lowers the symmetry from cubic to trigonal at 44 K, resulting in twinned crystals. Below 13 K, a complex magnetic phase diagram consisting of cycloidal, skyrmion, and ferromagnetic regions is observed. Electron spin resonance has been applied to get insight into the magetization dynamics. Broadband microwave experiments at low temperatures show excitations at 5 GHz and above 15 GHz as well as additional intermediate signals characteristic of the skyrmion lattice phase.