Spectral Properties of delta-Plutonium: Sensitivity to 5f Occupancy

Details Spectral Properties of delta-Plutonium: Sensitivity to 5f Occupancy Spectral Properties of delta-Plutonium: Sensitivity to 5f Occupancy

2007-05-09

arxiv.org/abs/0705.1354v2

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 2 embedded color figures, to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.76.245118

By combining the local density approximation (LDA) with dynamical mean field theory (DMFT), we report a systematic analysis of the spectral properties of $\delta$-plutonium with varying $5f$ occupancy. The LDA Hamiltonian is extracted from a tight-binding (TB) fit to full-potential linearized augmented plane-wave (FP-LAPW) calculations. The DMFT equations are solved by the exact quantum Monte Carlo (QMC) method and the Hubbard-I approximation. We have shown for the first time the strong sensitivity of the spectral properties to the $5f$ occupancy, which suggests using this occupancy as a fitting parameter in addition to the Hubbard $U$. By comparing with PES data, we conclude that the ``open shell'' $5f^{5}$ configuration gives the best agreement, resolving the controversy over $5f$ ``open shell'' versus ``close shell'' atomic configurations in $\delta$-Pu.

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