Magnetic properties and the electronic structure of LiCoO_2

TL;DR

This paper uses the QUASST theory to analyze the magnetic and electronic properties of LiCoO_2, emphasizing strong electron correlations, spin-orbit coupling, and local symmetry, and compares it with related compounds.

Contribution

It provides a comprehensive explanation of LiCoO_2's properties considering strong correlations and local symmetry, linking it with similar cobalt oxides.

Findings

Co^3+ ions are in a low-spin state due to crystal-field interactions.

LiCoO_2 exhibits a large orbital magnetic moment.

Properties are consistent with those of NaCoO_2 and LaCoO_3.

Abstract

We have described properties of LiCoO_2 within the Quantum Atomistic Solid State (QUASST) theory taking into account very strong electron correlations, predominantly of the intra-atomic origin, spin-orbit coupling and the detailed local crystallographic surroundings and its symmetry. Properties of LiCoO_2 are consistently explained together with NaCoO_2 and LaCoO_3 - in all of these compounds the Co^3+ ions occur in the low-spin state. This low-spin state is the effect of the relatively strong crystal-field interactions (B_4^z = +320 K <=> 10Dq = 3.3 eV) and is a manifestation of the very large orbital moment of the Co^3+ ion.