Study of Fermi liquid behaviour in Kagome-semimetal Ni3In2S2*

The Kagome metals have been generating much interest due to their capacity to exhibit several intriguing properties, such as frustrated magnetism, topological state, superconductivity, charge order and correlated phenomena. Here, we report the synthesis and characterisation of the Kagome metal Ni₃In₂S₂ and study the transport properties of the Kagome metal. The T² dependency of resistivity, also known as the Baber law, is a property of a Fermi liquid. The majority of metals, however, only exhibit this behaviour at extremely low temperatures, often below 20 K. Our experimental study shows that this T² dependency holds over an extensive temperature range up to 86 K for the single-crystal Kagome semimetal Ni₃In₂S₂, showing that the electron-electron scattering mechanism dominates in this sample. Most importantly, with T² resistivity, Kadowaki-Woods scaling has been tested. The Debye temperature Ɵ_D=92.09K, obtained from the specific heat study near the cross-over temperature. A quantum linear magneto-resistance is seen in the magneto-transport experiment, reaching up to 286% at 2K and 6 T and showing no signs of saturation. This type of behaviour is due to open orbits on the Fermi surface.  However, our findings open a new door for exploring the exciting physics of electron-electron interaction and illuminate the possible reason for this unconventional behaviour.