Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-07-04
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, 2 figures, submitted to proceedings of LT24, Orlando, FL, August 2005; added reference
Scientific paper
10.1063/1.2354903
We analyze the normal electronic states of Na$_{0.35}$CoO$_2$ based on the multi-orbital Hubbard model using the FLEX approximation. The fundamental electronic property of this system is drastically changed by the presence or absence of the small hole pockets associated with the $e_g'$ orbital. This change of the Fermi surface topology may be caused by the crystalline electric splitting due to the trigonal distortion. When small hole pockets are absent, the weak pseudogap bahaviors appear in the density of states and the uniform spin susceptibility, which are observed by recent experiments. We estimate the mass enhancement factor of quasiparticle $m^*/m\simeq 1.5\sim 1.8$. This result suppports recent ARPES measurements.
Kontani Hiroshi
Yada Keiji
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