Electronic Structure and Fermiology of PuCoGa${}_5$

Abstract

By using a relativistic linear augmented-plane-wave method, we clarify energy band structures and Fermi surfaces of recently discovered plutonium-based superconductor PuCoGa${}_5$. We find several cylindrical sheets of Fermi surfaces with large volume, very similar to CeMIn${}_5$ (M=Ir and Co) isostructural with PuCoGa${}_5$, in spite of different $f$-electron numbers between Ce${}^{3+}$ and Pu${}^{3+}$ ions. The similarity is understood by a concept of electron-hole conversion in a tight binding model constructed based on the $j$-$j$ coupling scheme. Based on the present results, we provide a possible scenario to explain why a transition temperature is so high as 18.5K in PuCoGa${}_5$.

4 pages, Revtex, with 4 figures embedded in the text. Submitted to Phys. Rev. Lett

References in corpus (2)

• Construction of microscopic model for f-electron systems on the basis of j-j coupling scheme
• Spin Fluctuation Induced Superconductivity Controlled by Orbital Fluctuation

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