We report experimental and theoretical investigations on the quaternary Heusler alloy CoRuTiGe, synthesized using the arc melting technique. Crystal structure analysis reveals a tetragonal structure at room temperature. Magnetization measurements as a function of temperature and magnetic field indicate a ferromagnetic nature with a saturation magnetization of 0. 6810. 28em{0ex}₁/f. u. at 5 K. The temperature dependence of electrical resistivity shows a nearly linear decrease in the high-temperature range, indicating the spin gapless semiconductor (SGS) like behavior of the material. This SGS nature is further supported by the weak temperature-dependent carrier concentration and mobility. Hall effect analysis reveals that the anomalous Hall effect in CoRuTiGe arises from both intrinsic and extrinsic mechanisms. Additionally, a well-defined symmetric negative magnetoresistance is observed at low temperatures. These results offer insights that could aid in designing new spin gapless semiconductors with enhanced Curie temperatures for spintronic applications.
Kumar et al. (Thu,) studied this question.