Antiferromagnetism in the ordered subsystem of Cr ions intercalated into titanium diselenide

The results of crystal structure, bulk magnetic properties and magnetic structure investigations are reported for the intercalated compound Cr0.5TiSe2. The Cr atoms are found to be ordered in the hexagonal TiSe2 matrix forming a superlattice a=a'√3, b = a', c = 2c'. The first neutron diffraction measurements performed for this compound together with susceptibility and magnetization data have shown that this compound exhibits a complex incommensurate magnetic structure below TN = 42K. This structure is suggested to arise from the competition between the ferromagnetic exchange interaction dominating mainly within the Cr layers and antiferromagnetic interlayer exchange. Because of weakness of the interlayer exchange in comparison with intralayer one this compound exhibits metamagnetic properties