|
KMID : 1102020170470030187
|
|
Applied Microscopy
2017 Volume.47 No. 3 p.187 ~ p.202
|
|
|
Review on Electronic Correlations and the Metal?Insulator Transition in SrRuO3
|
|
Pang Su-Been
|
|
|
Abstract
|
|
|
|
The classical electron band theory is a powerful tool to describe the electronic structures of solids. However, the band theory and corresponding density functional theory become inappropriate if a system comprises localized electrons in a scenario wherein strong electron correlations cannot be neglected. SrRuO3 is one such system, and the partially localized d-band electrons exhibit some interesting behaviors such as enhanced effective mass, spectral incoherency, and oppression of ferromagnetism and itinerancy. In particular, a Metal?Insulator transition occurs when the thickness of SrRuO3 approaches approximately four unit cells. In the computational studies, irrespective of the inclusion of on-site Hubbard repulsion and Hund’s coupling parameters, correctly depicting the correlation effects is difficult. Because the oxygen atoms and the symmetry of octahedra are known to play important roles in the system, scrutinizing both the electronic band structure and the lattice system of SrRuO3 is required to find the origin of the correlated behaviors. Transmission electron microscopy is a promising solution to this problem because of its integrated functionalities, which include atomic-resolution imaging and electron energy loss spectroscopy.
|
|
|
KEYWORD
|
|
|
SrRuO3, 4d orbital, Electronic correlation, Metal-Insulator transition, Transmission electron microscopy
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|