Characteristic Fermi surface properties of V₂Ga₅, CoGa₃, TiGa₃, ZrGa₃, and ZrAl₃ with different tetragonal structures

To clarify the Fermi surface properties based on the dimensionality of electronic states, we grew single crystals of V₂Ga₅, CoGa₃, TiGa₃, and ZrGa₃ (ZrAl₃) with different tetragonal structures and carried out de Haas-van Alphen experiments, together with full-potential linearized augmented plane wave band calculations. A nearly one-dimensional plate Fermi surface is obtained in the band calculations for V₂Ga₅ with a flat tetragonal structure. The corresponding single crystal is of needle shape along the tetragonal [001] direction. The obtained Fermi surfaces of CoGa₃ are very similar to those of Ni₃Ga with the AuCu₃-type cubic structure because the crystal structure of CoGa₃ is nearly cubic and the corresponding single crystal is of pyramidal shape with a flat (111) plane. The Fermi surfaces of TiGa₃ are also very similar to those of YCu₂Si₂ with the ThCr₂Si₂-type tetragonal structure. The cylindrical Fermi surfaces with concave and convex parts are realized in ZrGa₃ and ZrAl₃ with the flat Brillouin zone. The corresponding tetragonal structure is extremely long along the [001] direction.