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We report the de Haas-van Alphen (dHvA) effect and magnetoresistance in thefilled-skutterudite superconductor LaRu4P12, which is a reference material ofPrRu4P12 that exhibits a metal-insulator (M-I) transition at T_MI~60 K. Theobserved dHvA branches for the main Fermi surface (FS) are well explained bythe band-structure calculation, using the full potential linearizedaugmented-plane-wave method with the local-density approximation, suggesting anesting instability with q =(1,0,0) in the main multiply connected FS asexpected also in PrRu4P12. Observed cyclotron effective masses of(2.6-11.8)m_0, which are roughly twice the calculated masses, indicate thelarge mass enhancement even in the La-skutterudites. Comparing the FS betweenLaRu4P12 and PrRu4P12, an essential role of c-f hybridization cooperating withthe FS nesting in driving the the M-I transition in PrRu4P12 has beenclarified.Comment: Appeared in Physical Review

physical review. b, condensed matter and materials physics

Fermi surface of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>LaRu</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math>: A clue to the origin of the metal-insulator transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>PrRu</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="…

Fermi surface ofLaRu4P12: A clue to the origin of the metal-insulator transition inPrRu4