High field magnetoresistance and de Haas-van Alphen effect in LaRu ₂Al₁₀

We have measured the magnetoresistance and de Haas-van Alphen (dHvA) effect in LaRu₂Al₁₀, which is a reference compound of CeRu ₂Al₁₀ that exhibits an unusual transition at T₀ 27K. The magnetoresistance increases with increasing magnetic field at low temperatures in the wide field directions, suggesting that LaRu ₂Al₁₀ is a compensated metal without an open orbit. From the dHvA experiments, about three dHvA frequency branches whose cyclotron effective masses are close to 1m₀ (m₀: rest mass of an electron) were detected. The observed dHvA branches for the main Fermi surface are well explained by the results of band structure calculation based on a full potential linearized augmented-plane-wave (FLAPW) method and local-density approximation (LDA), that demonstrates the multiply connected Fermi surface with no nesting property in LaRu₂Al₁₀.