Comparison of the Electronic Structures of Two Non-cuprate Layered Transition Metal Oxide Superconductors

Abstract

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.

arXiv comment5 pages, 3 embedded figures (Proceedings in third Hiroshima international workshop)

References in corpus (8)

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Cited by in corpus (2)

• The crucial importance of the $t_{2g}$--$e_g$ hybridization in transition metal oxides
• Correlation Effects in the Triangular Lattice Single-band System Li_xNbO_2