Abstract
Electronic structure calculations have been performed to explain the difference in the electronic properties of two crystallographic forms of The calculations can explain the qualitatively different resistivities of isoelectronic - and - below 100 K. The difference in symmetry between the hexagonal four-layer and the rhombohedral nine-layer compound allows the formation of a gap for the later. The electronic structure of these hexagonal perovskites is compared with the more familiar cubic perovskite
- Received 8 November 1999
DOI:https://doi.org/10.1103/PhysRevB.61.10005
©2000 American Physical Society