Physics – Condensed Matter – Superconductivity
Scientific paper
2005-12-09
Physica B 383, 63 (2006)
Physics
Condensed Matter
Superconductivity
5 pages, 3 embedded figures (Proceedings in third Hiroshima international workshop)
Scientific paper
10.1016/j.physb.2006.03.057
Comparison is made of the electronic structure of the little-studied layered transition metal oxide LiNbO$_2$ with that of Na$_x$CoO$_2$, which has attracted tremendous interest since superconductivity was discovered in its hydrate. Although the active transition metal $d$ states are quite different due to different crystal fields and band filling, both systems show a strong change of electronic structure with changes in the distance between the transition metal ion layer and the oxygen layers. The niobate is unusual in having a large second-neighbor hopping amplitude, and a nearest neighbor hopping amplitude that is sensitive to the Nb-O separation. Li$_x$NbO$_2$ also presents the attractive simplicity of a single band triangular lattice system with variable carrier concentration that is superconducting.
Lee Kuang Wu
Pickett Warren E.
Ylvisaker Erik R.
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