Energy Landscape analysis of metal-insulator transitions: theory and application to Ca${}_2$RuO${}_4$, $R$NiO${}_3$ and their heterostructures

Abstract

We present a general methodology that enables the disentanglement of the electronic and lattice contributions to the metal-insulator transition by building an energy landscape from numerical solutions of the equation of state. The methodology works with any electronic structure method that provides electronic expectation values at given atomic positions. Applying the theory to rare-earth perovskite nickelates ($R$NiO${}_3$) and Ruddlesden-Popper calcium ruthenates (Ca${}_2$RuO${}_4$) in bulk, heterostructure and epitaxially strained thin film forms using equation of state results from density functional plus dynamical mean field calculations we show that the electron-lattice coupling is an essential driver of the transition from the metallic to the insulating state in these materials.

References in corpus (6)

• Low-energy description of the metal-insulator transition in the rare-earth nickelates
• Gutzwiller density functional theory for correlated electron systems
• Orbital Polarization in Strained LaNiO${}_3$: Structural Distortions and Correlation Effects
• Renormalization of effective interactions in a negative charge-transfer insulator
• Effect of strain on magnetic and orbital ordering of LaSrCrO${}_3$/LaSrMnO${}_3$ heterostructures
• The driving force for charge ordering in rare earth nickelates

Cited by in corpus (1)

• Fully {\it ab-initio} electronic structure of Ca${}_2$RuO${}_4$