We present an angle-resolved photoemission spectroscopy (ARPES) 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. We observe a systematic change in the spectral weight of the coherent and incoherent parts, accompanied by an energy shift of the incoherent part. The band dispersion also shows the emergence of a weakly dispersing state at the Fermi energy with increasing conductivity. These changes correspond with the changes in the temperature-dependent resistivity behavior. We address the nature of the coherent-incoherent parts in relation to the peak-dip-hump feature seen in cuprates superconductors.
@article{arxiv.cond-mat/0610271,
title = {ARPES Study of the Metal-Insulator Transition in Bismuth Cobaltates},
author = {Z. Yusof and B. O. Wells and T. Valla and P. D. Johnson and A. V. Fedorov and Q. Li and S. M. Loureiro and R. J. Cava},
journal= {arXiv preprint arXiv:cond-mat/0610271},
year = {2009}
}