This item is non-discoverable
Loading...
Non-discoverable
Electronic structure of negative charge transfer CaFeO3 across the metal-insulator transition
Rogge, PC Chandrasena, RU Cammarata, A Green, RJ Shafer, P Lefler, BM Huon, A Arab, A Arenholz, E Lee, HN
Rogge, PC
Chandrasena, RU
Cammarata, A
Green, RJ
Shafer, P
Lefler, BM
Huon, A
Arab, A
Arenholz, E
Lee, HN
Citations
Altmetric:
Genre
Pre-print
Date
2018-01-30
Advisor
Committee member
Group
Department
Permanent link to this record
Collections
Research Projects
Organizational Units
Journal Issue
DOI
10.1103/PhysRevMaterials.2.015002
Abstract
© 2018 American Physical Society. We investigated the metal-insulator transition for epitaxial thin films of the perovskite CaFeO3, a material with a significant oxygen ligand hole contribution to its electronic structure. We find that biaxial tensile and compressive strain suppress the metal-insulator transition temperature. By combining hard x-ray photoelectron spectroscopy, soft x-ray absorption spectroscopy, and density functional calculations, we resolve the element-specific changes to the electronic structure across the metal-insulator transition. We demonstrate that the Fe sites undergo no observable spectroscopic change between the metallic and insulating states, whereas the O electronic configuration undergoes significant changes. This strongly supports the bond-disproportionation model of the metal-insulator transition for CaFeO3 and highlights the importance of ligand holes in its electronic structure. By sensitively measuring the ligand hole density, however, we find that it increases by ∼5-10% in the insulating state, which we ascribe to a further localization of electron charge on the Fe sites. These results provide detailed insight into the metal-insulator transition of negative charge transfer compounds and should prove instructive for understanding metal-insulator transitions in other late transition metal compounds such as the nickelates.
Description
Citation
Citation to related work
American Physical Society (APS)
Has part
Physical Review Materials
ADA compliance
For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu