Electronic structure in (Hg0.5Pb0.5) Sr2(Ca1 - XYx) Cu2O7 compounds studied by soft X-ray absorption spectroscopy

J. M. Chen*, R. S. Liu, S. F. Hu


研究成果: 雜誌貢獻期刊論文同行評審

2 引文 斯高帕斯(Scopus)


We report O K-edge and Cu L23-edge X-ray-absorption near-edge-structure (XANES) spectra for the series of (Hg0.5Pb0.5)Sr2(Ca1 - xYx)Cu2O7 compounds (x = 0.3-0.7) obtained using a bulk-sensitive total-X-ray-fluorescence-yield technique. Near the O 1s edge, the pre-edge peak with maxima at ∼ 528.3 eV is ascribed to the transitions to O 2p holes located in the CuO2 planes. The intensity of this pre-edge peak monotonically increases with increasing doping level of Ca2+ into the Y3+ sites. The effect of chemical substitution of Ca2+ for Y3+ in (Hg0.5Pb0.5)Sr2(Ca1 - xYx)Cu2O7 is to induce O 2p hole states in the CuO2 planes near the Fermi level which cause an increase of Tc from 15 K for x = 0.6 to 90 K for x = 0.3. Moreover, the generation of O 2p holes within the CuO2 planes is probably responsible for inducing a transition from a semiconductor to a superconductor. In the Cu L-edge absorption spectra, high-energy shoulders at 933.2 and 953.0 eV are attributed to the transitions to the Cu(2p3/2,1/2)-13d10L states in the CuO2 layers, where L denotes the O 2p ligand hole. The behavior of these shoulders correlates with that of the pre-edge peak at ∼ 528.3 eV in the O K-edge absorption spectra.

頁(從 - 到)180-186
期刊Physica C: Superconductivity and its applications
出版狀態已發佈 - 1996 12月 1

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 能源工程與電力技術
  • 電氣與電子工程


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