Fermi-surface topology and field-dependent effective masses of the filled skutterudite compound PrOs₄As₁₂

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• 作者：J. Singleton ; Pei-Chun Ho ; M.B. Maple ; Hisatomo Harima ; P.A. Goddard ; Z. Henkie
• 关键词：Skutterudites ; de Haas-van Alphen effect ; Fermi surface ; Effective mass
• 刊名：Physica B
• 出版年：2008
• 出版时间：1 April 2008
• 年：2008
• 卷：403
• 期：5-9
• 页码：758-760
• 全文大小：658 K

文摘

We report magnetic-field-orientation dependent de Haas-van Alphen (dHvA) experiments on the filled skutterudites PrOs₄As₁₂ and LaOs₄As₁₂. The Fermi surfaces of the compounds are very similar and in reasonable agreement with bandstructure calculations for LaOs₄As₁₂ on a PrOs₄As₁₂ lattice. This suggests that the 4f electrons are essentially localized in the paramagnetic phase of PrOs₄As₁₂. Whilst the properties of LaOs₄As₁₂ suggest a conventional nonmagnetic Fermi liquid, the effects of direct exchange and electron correlations cause dHvA beat frequencies and field-dependent quasiparticle masses in PrOs₄As₁₂.