Electrical and optical properties of a PtSn₄ single crystal

A topological semimetal PtSn4 single crystal was grown by method of crystallization from a solution in a melt. Then the electrical resistivity and galvanomagnetic properties (magnetoresistivity and the Hall effect) were studied in the temperature range from 4.2 to 80 K and in magnetic fields up to 100 kOe. The optical measurements were carried out at room temperature. The residual resistivity is shown to be low enough and amount to ~ 0.5 μOhmcm. The temperature dependence of the electrical resistivity has a metallic type, increasing monotonically with temperature. A sufficiently large magnetoresistance of 750% is observed. The majority carriers are supposed to be holes with a concentration of ~ 6.81021 cm−3 and mobility of ~ 1950 cm2/Vs at T = 4.2 K as a result of the Hall effect studies. The optical properties of PtSn4 have features characteristic of bad metals.