The Fermi surface in filled skutterudite RFe4P12 (R=La and Nd)

We have investigated the de Haas-van Alphen (dHvA) effect and the transvers e magnetoresistance in filled skutterudite LaFe4P12 and NdFe4P12. The Fermi surface of LaFe4P12 consists of a nearly spherical hole sheet and a multip ly connected one. These features are explained reasonably well by a full po tential linearized augmented-plane-wave (FLAPW) band structure calculation, The Fermi surface of NdFe4P12 is similar to those in LaFe4P12 except the e xchange splitting in the dHvA frequencies. The cyclotron effective masses a re enhanced roughly twice compared to those of LaFe4P12 due to the electron -magnon interaction.