We present an angle-resolved photoemission spectroscopy study of a Mott-Hubbard-type bismuth cobaltate system across a metal-insulator transition. By varying the amount of Pb substitution and by doping with Sr or Ba cation, a range of insulating to metallic properties is obtained. The electronic structure shows the emergence of a weakly dispersing state at the Fermi energy with increasing conductivity. A systematic change in the spectral weight of the coherent and incoherent parts, accompanied by an energy shift of the incoherent part, is also observed. The changes may be correlated with changes in the temperature-dependent resistivity. The nature of the coherent-incoherent components is compared to the peak-dip-hump feature seen in cuprate superconductors.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Oct 15 2007|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics