Interlayer coupling and electronic structure of misfit-layered bismuth-based cobaltites
Abstract
The [Bi2M2O4] pCoO2 materials (M =Ca , Sr, and Ba) were studied to clarify the effect of the lattice incommensurability on electronic properties using angle-resolved photoemission spectroscopy and transmission electron microscopy (TEM). Results show that the insulating behavior is characterized by a spectral weight for binding energies higher than 2.0 eV. Moreover, the spectral shape is modified as a function of the incident photon energy, demonstrating a close relationship between the electrical properties and interlayer coupling. TEM results show that the effect of the lattice mismatch differs for different misfit parameters p . We therefore conclude that the carrier concentration and the chemical environment at the misfit interface, which depend on the degree of incommensurability, mutually determine the electronic properties of the system.
- Publication:
-
Physical Review B
- Pub Date:
- May 2017
- DOI:
- 10.1103/PhysRevB.95.195166
- Bibcode:
- 2017PhRvB..95s5166T