Volume 69, Number 6, March 2005
|Page(s)||984 - 989|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||16 February 2005|
: A two-fluid incoherent metal?
Department of Physics, Loughborough University - Loughborough, LE11 3TU, UK
2 Institut für Theoretische Physik, Universität zu Köln 77 Zülpicher Strasse, D-50937 Köln, Germany
Accepted: 14 January 2005
We present ab initio LDA+DMFT results for the many-particle density of states of on the metallic side of the strongly first-order (T-driven) insulator-metal transition. In strong contrast to LDA predictions, there is no remnant of even correlated Fermi-liquid behavior in the correlated metal. Excellent quantitative agreement with published photoemission and X-ray absorption experiments is found in the metallic phase. We argue that the absence of FL-quasiparticles provides a natural explanation for the bad-metallic transport for . Based on this agreement, we propose that the I-M transition in is an orbital-selective Mott transition, and point out the relevance of orbital-resolved one-electron and optical spectroscopy to resolve this outstanding issue.
PACS: 71.28.+d – Narrow-band systems; intermediate-valence solids / 71.30.+h – Metal-insulator transitions and other electronic transitions / 72.10.-d – Theory of electronic transport; scattering mechanisms
© EDP Sciences, 2005
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