Fermi surface of the filled-skutterudite superconductor LaRu4P12: A clue to the origin of the metal-insulator transition in PrRu4P12

Abstract

We report the de Haas-van Alphen (dHvA) effect and magnetoresistance in the filled-skutterudite superconductor LaRu4P12, which is a reference material of PrRu4P12 that exhibits a metal-insulator (M-I) transition at T_MI~60 K. The observed dHvA branches for the main Fermi surface (FS) are well explained by the band-structure calculation, using the full potential linearized augmented-plane-wave method with the local-density approximation, suggesting a nesting instability with q =(1,0,0) in the main multiply connected FS as expected also in PrRu4P12. Observed cyclotron effective masses of (2.6-11.8)m_0, which are roughly twice the calculated masses, indicate the large mass enhancement even in the La-skutterudites. Comparing the FS between LaRu4P12 and PrRu4P12, an essential role of c-f hybridization cooperating with the FS nesting in driving the the M-I transition in PrRu4P12 has been clarified.

arXiv commentAppeared in Physical Review B

References in corpus (6)

• Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
• Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12
• Fermi surface of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Exotic Heavy Fermion State in the Filled Skutterudite PrFe${}_4$P${}_{12}$ Uncovered by the de Haas-van Alphen Effect
• Structural Phase Transition Accompanied by Metal - Insulator Transition in PrRu4P12
• Theory of Metal-Insulator Transition in PrRu4P12 and PrFe4P12

Cited by in corpus (2)

• Role of p-f Hybridization in the Metal-Non-Metal Transition of PrRu4P12
• f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu4P12