TY - JOUR
T1 - Hole states of hot-pressed samples of La2-xSrxCuO4-δ X-ray absorption spectroscopy studies
AU - Lee, S. B.
AU - Chang, C. N.
AU - Hsieh, C. H.
AU - Liu, C. T.
N1 - Funding Information:
This work was supported in part by the National Science Council of the Republic of China under the project no. NSC-87-2613-M003-001. A full support from the staffs of the SRRC was very much appreciated.
PY - 2001/2/1
Y1 - 2001/2/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S0921-4534(00)01574-4
DO - 10.1016/S0921-4534(00)01574-4
M3 - Article
AN - SCOPUS:0035252498
VL - 350
SP - 46
EP - 54
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 1-2
ER -