High Field Magnetoresistance and de Haas--van Alphen Effect in LaRu2Al10

We have measured the magnetoresistance and de Haas–van Alphen (dHvA) effect in LaRu 2 Al 10 , which is a reference compound of CeRu 2 Al 10 that exhibits an unusual transition at T 0 ≃27 K. The magnetoresistance increases with increasing magnetic field at low temperatures in the wide field directions, suggesting that LaRu 2 Al 10 is a compensated metal without an open orbit. From the dHvA experiments, about three dHvA frequency branches whose cyclotron effective masses are close to 1 m 0 ( m 0 : 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 LaRu 2 Al 10 .