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Phys. Rev. B 66, 113105 (2002) [4 pages]

Bulk-sensitive photoemission spectroscopy of A2FeMoO6 double perovskites (A=Sr,Ba)

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J.-S. Kang1, J. H. Kim1, A. Sekiyama2, S. Kasai2, S. Suga2, S. W. Han3, K. H. Kim3, T. Muro4, Y. Saitoh5, C. Hwang6, C. G. Olson7, B. J. Park8, B. W. Lee8, J. H. Shim9, J. H. Park9, and B. I. Min9
1Department of Physics, The Catholic University of Korea, Puchon 420-743, Korea
2Department of Material Physics, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
3Department of Physics, Gyeongsang National University, Chinju 660-701, Korea
4Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Hyogo 679-5198, Japan
5Department of Synchrotron Radiation Research, Kansai Research Establishment, Japan Atomic Energy Research Institute (JAERI), SPring-8, Hyogo 679-5148, Japan
6Korea Research Institute of Standards and Science, Taejon 305-600, Korea
7Ames Laboratory, Iowa State University, Ames, Iowa 50011, U.S.A.
8Department of Physics, Hankuk University of Foreign Studies, Yongin, Kyungki 449-791, Korea
9Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea

Received 8 July 2002; published 30 September 2002

The electronic structures of Sr2FeMoO6 (SFMO) and Ba2FeMoO6 (BFMO) double perovskites have been investigated using Fe 2p⃗3d resonant photoemission spectroscopy (PES) and the Cooper minimum in the Mo 4d photoionization cross section. The states close to the Fermi level are found to have a strongly mixed Mo–Fe t2g character, indicating that the Fe valence is far from pure 3+. The Fe 2p3/2 x-ray absorption spectroscopy spectra reveal the mixed-valent Fe3+–Fe2+ configurations, and a larger Fe2+ component for BFMO than for SFMO, suggesting an operative double exchange interaction. The valence-band PES spectra reveal good agreement with the local-spin-density-approximation (LSDA)+U calculation.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.113105
DOI:
10.1103/PhysRevB.66.113105
PACS:
75.70.Pa, 71.30.+h, 79.60.-i
 
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