Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-10-05
Phys. Rev. Lett. 94, 067003 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.94.067003
In order to clarify magnetic properties of filled skutterudites, we analyze the Anderson model including seven $f$ orbitals hybridized with an $a_{\rm u}$ conduction band using a numerical technique. For $n$=2 corresponding to Pr-based filled skutterudites, where $n$ is the local $f$-electron number, even if the ground state is a singlet, there remain significant magnetic fluctuations from a triplet state with a small excitation energy. This result can be understood by the fact that $f$-electron states are clearly distinguished as itinerant and localized ones in the filled skutterudite structure. This picture also explains the complex results for $f$-electron magnetic susceptibility and entropy for $n$=1$\sim$13.
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