Magnetic correlations and transport properties in triangular-lattice nickel germanide Ni1.8Ge single crystal

Magnetic and transport properties of triangular-lattice Ni1.8Ge single crystal have been studied. The results reveal that Ni1.8Ge is a metal with an obvious magnetic anisotropy. The compound exhibits ferrimagnetic correlations along both directions. However, the long-range magnetic order was not observed due to the geometrical frustration arising from the triangular nickel lattice. At low temperature, the electron-magnon scattering and spin fluctuation have obvious contributions to the resistivity and magnetoresistance, indicating the existence of short-range dynamic magnetic ordering.