Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-04-24
Phys. Rev. B 71, 132502 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
Appeared in Physical Review B
Scientific paper
10.1103/PhysRevB.71.132502
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.
Aoki Yasumichi
Harima Hisatomo
Inada Yasuhiro
Onuki Yoshichika
Saha Shanta Ranjan
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