Origin of size effect on superconductivity in (R0.8Pr0.2)Ba2Cu3O7 studied by soft X-ray absorption spectroscopy

J. M. Chen*, P. Nachimuthu, Jiunn-Yuan Lin, I. P. Hong, C. F. Chang, H. D. Yang

*此作品的通信作者

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

O K-edge X-ray absorption near-edge structure (XANES) spectroscopy of (R0.8Pr0.2)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 1s absorption edge, pre-peaks at ~527.8 and ~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-xPrx)Ba2Cu3O7 with ionic radius of the R3+ ions results predominantly from the hole-depletion effect.

原文American English
頁(從 - 到)85-91
頁數7
期刊Chemical Physics Letters
337
發行號1-3
DOIs
出版狀態Published - 30 3月 2001

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