Hole states of hot-pressed samples of La2-xSrxCuO4-δ X-ray absorption spectroscopy studies

S. B. Lee, C. N. Chang, C. H. Hsieh, C. T. Liu

研究成果: 雜誌貢獻文章

1 引文 斯高帕斯(Scopus)

摘要

A series of samples of La2-xSrxCuO4 with x = 0, 0.10, 0.15, 0.20, and 0.30, had been prepared in the ambient pressure (AP). The AP samples were annealed under high pressure (2.0 GPa), with and without adding oxidant, to obtain hot-pressed (HP) samples. The lattice structures of the HP samples were observed to be similar to the AP samples, while Tc was found to decrease but the one with x = 0.30 became superconducting. The O-1s and the Cu-2p3/2 X-ray near-edge-absorption spectra (XNEAS) are measured for all as prepared samples, by using synchrotron radiation. Both spectra indicate that the number of holes is depleted after the hot-press treatment. The depletion of holes is found mainly due to the depletion of oxygen. The correlation of Tc with the number of holes, as derived from the O-1s XNEAS, is found not universal. It can be grouped according to the Sr content, x, a new phenomenon that is not seen before.

原文英語
頁(從 - 到)46-54
頁數9
期刊Physica C: Superconductivity and its applications
350
發行號1-2
DOIs
出版狀態已發佈 - 2001 二月 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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