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We have carried out a comparative study of the electronic specific heat andelectronic structure of $\alpha$ and $\delta$-plutonium using dynmical meanfield theory (DMFT). We use the perturbative T-matrix and fluctuating exchange(T-matrix FLEX) as a quantum impurity solver. We considered two differentphysical pictures of plutonoium. In the first, $5{f^5}+$, the perturbativetreatment of electronic correlations has been carried out around thenon-magnetic (LDA) Hamiltonian, which results in an f occupation around a bitabove $n_f = 5 $. In the second, $5{f^6}-$, plutonium is viewed as being closeto an $5{f^6}$ configuration, and perturbation theory is carried out around the(LDA+U) starting point bit below $n_f = 6 $. In the latter case the electronicspecific heat coefficient $\gamma$ attains a smaller value in $\gamma$-Pu thanin $\alpha$-Pu, in contradiction to experiment, while in the former case ourcalculations reproduce the experimentally observed large increase of $\gamma$in $\delta$-Pu as compared to the $\alpha$ phase. This enhancement of theelectronic specific heat coefficient in $\delta$-Pu is due to strong electroniccorrelations present in this phase, which cause a substantial increase of theelectronic effective mass, and high density of states at $E_F$. The densitiesof states of $\alpha$ and $\delta$-plutonium obtained starting from theopen-shell configuration are also in good agreement with the experimentalphotoemission spectra.Comment: 6 pages, 3 figure

physical review. b, condensed matter and materials physics

Dynamical mean-field theory investigation of specific heat and electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>- and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>δ</mml:mi></mml:math>-plutonium

Dynamical mean-field theory investigation of specific heat and electronic structure ofα- andδ-plutonium