Phase transition and electron localization in 1T-TaS2

Transport and magnetic properties of Fe(x)VSe(2) (x = 0-0.33)

We present the results of the effect of Fe intercalation on the structural, transport and magnetic properties of 1T-VSe(2). Intercalation of iron suppresses the charge density wave transition at 110 K in 1T-VSe(2). And for more than 10% Fe concentration a new kind of first-order transition appears below 160 K in our resistivity results. The transition becomes stronger with a broad hysteresis (80-160 K) for 33% Fe intercalation. The anomalies are absent in the thermopower measurements of polycrystalline Fe(x)VSe(2) compounds (x = 0-0.33). The susceptibility measurements between 2 and 300 K and the magnetization in a high magnetic field up to 14 T at 2 K are reported. The Fe atoms are in the low-spin ( S = 1/2) state of Fe(3+) and the compounds show the absence of any magnetic order at low temperatures.