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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 26
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Phys. Rev. Lett. 82, 5321–5324 (1999)

Spectral Evolution in (Ca,Sr)RuO3 near the Mott-Hubbard Transition

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J. S. Ahn1, J. Bak1, H. S. Choi1, T. W. Noh1, J. E. Han2, Yunkyu Bang3, J. H. Cho4, and Q. X. Jia5
1Department of Physics, Seoul National University, Seoul 151-742, Korea
2Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569, Stuttgart, Germany
3Department of Physics, Chonnam National University, Kwangju 500-757, Korea
4RCDAMP and Department of Physics, Pusan National University, Pusan 609-735, Korea
5Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Received 14 July 1998; published in the issue dated 28 June 1999

We investigated optical properties of (Ca,Sr)RuO3 films on the borderline of a metal-insulator transition. Our results show all of the predicted characteristics for a metallic Mott-Hubbard system, including (i) a mass enhancement in dc limit, (ii) a U/2 excitation, and (iii) a U excitation. Also, self-consistency is exploited within the Gutzwiller-Brinkman-Rice picture for the Mott transition. Our finding displays that electron correlation should be important even in 4d materials. However, low frequency behaviors of electrodynamic quantities suggest extra scattering mechanisms in addition to the Mott-Hubbard correlation.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.5321
DOI:
10.1103/PhysRevLett.82.5321
PACS:
71.30.+h, 71.10.Fd, 71.27.+a, 78.20.-e
 
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