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Phys. Rev. B 72, 052411 (2005) [4 pages]

Electronic structure and evolution of the orbital state in metallic Ca2−xSrxRuO4

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Han-Jin Noh1,2, S.-J. Oh1, B.-G. Park3, J.-H. Park3,*, J.-Y. Kim2, H.-D. Kim2, T. Mizokawa4, L. H. Tjeng5, H.-J. Lin6, C. T. Chen6, S. Schuppler7, S. Nakatsuji8, H. Fukazawa8, and Y. Maeno8
1School of Physics & Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-742, Korea
2Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Korea
3Department of Physics & Electron Spin Science Center, Pohang University of Science and Technology, Pohang, Korea
4Department of Complexity Science and Engineering, University of Tokyo, Tokyo 113-0033, Japan
5II Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
6National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan
7Forschungszentrum Karlsruhe, ANKA P. O. Box 3640, D-76021 Karlsruhe, Germany
8Department of Physics, Kyoto University, Kyoto 606-01, Japan

Received 25 November 2004; published 24 August 2005

We investigated the electronic structure of a layered Ca2−xSrxRuO4 in a metallic regime (0.15⩽x⩽2.0) using a polarization dependent O 1s x-ray absorption spectroscopy. The spectrum shows strong variations with the polarization especially in Ru 4d region, which enables us to identify the electronic states. The spectral line shape gradually changes with increase of Sr concentration, and agrees well with an unrestricted Hartree-Fock analysis, which suggests evolution of the orbital states and provides clues for how the lattice distortion affects the orbital occupations.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.052411
DOI:
10.1103/PhysRevB.72.052411
PACS:
75.25.+z, 78.70.Dm, 71.30.+h, 71.28.+d

*Email address:jhp@postech.ac.kr

 
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