Complete d-Band Dispersion and the Mobile Fermion Scale in NaxCoO2
Strongly Correlated Electrons
2009-11-11 v1 Superconductivity
Abstract
We utilize fine-tuned polarization selection coupled with excitation-energy variation of photoelectron signal to image the \textit{complete d}-band dispersion relation in sodium cobaltates. A hybridization gap anticrossing is observed along the Brillouin zone corner and the full quasiparticle band is found to emerge as a many-body entity lacking a pure orbital polarization. At low dopings, the quasiparticle bandwidth (Fermion scale, many-body \textit{E} 0.25 eV) is found to be smaller than most known oxide metals. The low-lying density of states is found to be in agreement with bulk-sensitive thermodynamic measurements for nonmagnetic dopings where the 2D Luttinger theorem is also observed to be satisfied.
Keywords
Cite
@article{arxiv.cond-mat/0611621,
title = {Complete d-Band Dispersion and the Mobile Fermion Scale in NaxCoO2},
author = {D. Qian and L. Wray and D. Hsieh and L. Viciu and R. J. Cava and J. L. Luo and D. Wu and N. L. Wang and M. Z. Hasan},
journal= {arXiv preprint arXiv:cond-mat/0611621},
year = {2009}
}
Comments
4+ pages, 5 Figs