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    題名: Electronic structure of RuSr2EuCu2O8 studied by x-ray absorption and photoemission spectroscopies
    作者: Han, S. W.;Ling, D. C.;Tsai, H. M.;Chuang, C. H.;Wu, S. L.;Pong, W. F.;Chiou, J. W.;Tsai, M.-H.;Jang, L. Y.;Lin, H. J.;Pi, T. W.;Lee, J. F.
    貢獻者: 淡江大學物理學系
    日期: 2012-01-01
    上傳時間: 2013-01-15 17:05:18 (UTC+8)
    出版者: College Park: American Physical Society
    摘要: Local electronic structures of ruthenocuprate RuSr2EuCu2O8 (RuEu-1212) were investigated by using x-ray absorption near-edge structure (XANES) and valence-band photoemission (VB-PES) measurements at room temperature, 80 K, and 25 K. The XANES results indicate that when RuEu-1212 is below Curie temperature, TM, electrons are transferred not only from Cu 3d states, but also from Ru 4 d states, to O 2p orbitals. Additionally, the partial spectral weight distributions derived from VB-PES measurements provide evidence of a weak overlapping between Ru 4 d states and strongly Cu 3d−O 2p hybridized states below the Fermi level, which results in a weak coupling between the CuO2 and RuO2 layers. The analysis of extended x-ray absorption fine structure shows that the appearance of weak ferromagnetism and superconductivity is accompanied by a significant decrease of dynamic local lattice distortions of high-shell Cu-Sr and Ru-Sr bonding in RuEu-1212.
    關聯: Physical Review B 85(1), 014506(9pages)
    DOI: 10.1103/PhysRevB.85.014506
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