Universality in the Electronic Structure of 3d Transition Metal Oxides

TL;DR

This study investigates the electronic structures of various 3d transition metal oxides using density functional calculations, revealing universal patterns and developing empirical hypotheses to predict their properties.

Contribution

It introduces a generalized approach analyzing multiple TMO families, leading to empirical hypotheses based on symmetry and electronic interactions.

Findings

Identification of universal electronic structure features across TMO families

Development of empirical hypotheses for electronic and magnetic properties

Classification of hypotheses through point group symmetry

Abstract

Electronic structure of strongly correlated transition metal oxides (TMOs) is a complex phenomenon due to competing interaction among the charge, spin, orbital and lattice degrees of freedom. Often individual compounds are examined to explain certain properties associated with these compounds or in rare cases few members of a family are investigated to define a particular trend exhibited by that family. Here, with the objective of generalization, we have investigated the electronic structure of three families of compounds, namely, highly symmetric cubic mono-oxides, symmetry-lowered spinels and asymmetric olivine phosphates, through density functional calculations. From the results we have developed empirical hypotheses involving electron hopping, electron-lattice coupling, Hund's rule coupling, strong correlation and d-band filling. These hypotheses, classified through the point group symmetry of the transition metal - oxygen complexes, can be useful to understand and predict the electronic and magnetic structure of 3d TMOs.