Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00274 : Predicting Sommerfeld coefficients for heavy-fermion materials
Author:
From electronic-structure calculation standpoint we predict the
appearance of heavy-fermion behavior for Cerium and
Plutonium-based materials. Local-density approximation (LDA)
combined with dynamical-mean field theory (DMFT) formulated for
localized f-electrons gives an efficient realistic Kondo-lattice
description [1] for the target materials, yielding a
quasiparticle renormalization factor $z_c$ for conduction
electrons. We invert the data to get the quasiparticle
renormalization factor $z_f$ for f-electrons, and restore the
effective total density of states to predict the Sommerfeld
coefficient $\gamma$. Summarizing our data on an analogous
``Doniach phase diagram'' plotted for $z_c$, $z_f$, and $\gamma$,
$\gamma$ is found to have a peak around the magnetic quantum
critical point and Ce-115's are found to have the largest
$\gamma$'s among target materials.\\[4pt]
[1] PRL {\bf 103}, 096403 (2009).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.274
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