標題: Origin of size effect on superconductivity in (R-0.8 Pr-0.2)Ba2Cu3O7 studied by soft X-ray absorption spectroscopy
作者: Chen, JM
Nachimuthu, P
Lin, JY
Hong, IP
Chang, CF
Yang, HD
物理研究所
Institute of Physics
公開日期: 30-三月-2001
摘要: O K-edge X-ray absorption near-edge structure (XANES) spectroscopy of (R-0.8 Pr-0.2)Ba2Cu3O7 (R = Y, Tm, Dy, Gd, Eu and Sm) has been performed to investigate the dependence of hole distribution on ionic size of the R3+ ions. Near the O Is absorption edge, pre-peaks at similar to 527.8 and similar to 528.5 eV are assigned to transitions into O 2p hole states located in the CuO3 ribbons and CuO2 planes, respectively. As deduced from O K-edge X-ray absorption spectra, the hole concentrations in the CuO2 planes decrease monotonically with increasing ionic size of the rare-earth elements. The present XANES results clearly demonstrate that the suppression of superconductivity in (R1-x Pr-x)Ba2Cu3O7 With ionic radius of the R3+ ions results predominantly from the hole-depletion effect. (C) 2001 Elsevier Science B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/S0009-2614(01)00122-1
http://hdl.handle.net/11536/29758
ISSN: 0009-2614
DOI: 10.1016/S0009-2614(01)00122-1
期刊: CHEMICAL PHYSICS LETTERS
Volume: 337
Issue: 1-3
起始頁: 85
結束頁: 91
顯示於類別:期刊論文


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