Magneto structural phase transition in the frustrated metallic magnet Cr3Se4

The triangular lattice compound Cr3Se4 shows exciting and unusual magnetic and transport properties. This system is the binary sister compound of AgCrSe2 where a puzzling anomalous Hall effect is observed. In contrast to the doped semiconducting AgCrSe2, Cr3Se4 is intrinsically metallic and shows at least two magnetic phase transitions at a considerably higher energy scale. Our thermodynamic measurements suggest a strong coupling of the magnetic and the lattice degrees of freedom. Because of the strong dependence of the transport properties on the specific symmetry and details of the lattice we suggest an accurate characterisation of the crystal structure depending on temperature down well below the observed magnetic transition temperatures.