We investigated the optical properties of (Ca,Sr)RuO_3 films on the borderline of a metal-insulator (M-I) transition. Our results show all of the predicted characteristics for a metallic Mott-Hubbard system, including (i) a mass enhancement in dc-limit, (ii) an U/2 excitation, and (iii) an U excitation. Also, a self-consistency is found within the Gutzwiller-Brinkman-Rice picture for the Mott transition. Our finding displays that electron correlation should be important even in 4d materials.
@article{arxiv.cond-mat/9807209,
title = {Spectral evolution in (Ca,Sr)RuO_3 near the Mott-Hubbard transition},
author = {J. S. Ahn and J. Bak and H. S. Choi and T. W. Noh and J. E. Han and Yunkyu Bang and J. H. Cho and Q. X. Xia},
journal= {arXiv preprint arXiv:cond-mat/9807209},
year = {2009}
}
Comments
REVTEX 4 pages, 5 EPS figures, submitted to Phys. Rev. Lett