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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)46-54
Number of pages9
JournalPhysica C: Superconductivity and its applications
Volume350
Issue number1-2
DOIs
Publication statusPublished - 2001 Feb 1

Fingerprint

X ray absorption spectroscopy
absorption spectroscopy
Absorption spectra
x rays
X rays
depletion
Synchrotron radiation
Oxidants
absorption spectra
Oxygen
synchrotron radiation
oxygen

ASJC Scopus subject areas

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

Cite this

Hole states of hot-pressed samples of La2-xSrxCuO4-δ X-ray absorption spectroscopy studies. / Lee, S. B.; Chang, C. N.; Hsieh, C. H.; Liu, C. T.

In: Physica C: Superconductivity and its applications, Vol. 350, No. 1-2, 01.02.2001, p. 46-54.

Research output: Contribution to journalArticle

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