Orbital order in NaTiO$_2$ : A first principles study

Details Orbital order in NaTiO$_2$ : A first principles study Orbital order in NaTiO$_2$ : A first principles study

2011-09-07

arxiv.org/abs/1109.1426v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 6 figures

Scientific paper

The debate over the orbital order in layered triangular lattice system NaTiO$_2$ has been rekindled by the recent experiments of McQueen, et al. \cite{cava} on NaVO$_2$ ({\em Phys. Rev. Lett.} {\bf 101}, 166402 (2008)). In view of this, the nature of orbital ordering, in both high and low temperature states, is studied using an ab-initio electronic structure calculation. The orbital order observed in our calculations in the low temperature structure of NaTiO$_2$ is consistent with the predictions of McQueen, et. al. An LDA plus dynamical mean-field calculation shows considerable transfer of spectral weight from the Fermi level but no metal- insulator transition, confirming the poor metallic behaviour observed in transport measurements.

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