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 language | English |
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Pages (from-to) | 46-54 |
Number of pages | 9 |
Journal | Physica C: Superconductivity and its applications |
Volume | 350 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2001 Feb 1 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering