TY - JOUR
T1 - The study of electronic structure in new Hg-based Sr-containing 1212-typed (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 superconductors
AU - Liu, R. S.
AU - Chen, J. M.
AU - Hu, S. F.
N1 - Funding Information:
This research is financially supported by SRRC and National Science Council of the Republic of China under the Grant NSC-86-2113-M-002-020.
PY - 1997/8
Y1 - 1997/8
N2 - High resolution O K-edge X-ray-absorption near-edge-structure (XANES) spectra for the series of new Hg-based Sr-containing 1212-typed (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 superconductors (x = 0.3 ∼ 0.7) were measured using a bulk-sensitive total-X-ray-fluorescence-yield technique. Near the O 1s edge, the pre-edge peak with maxima at ∼ 528.3 eV is ascribed to transitions into O 2p holes located in the CuO2 planes. The intensity of this pre-edge peak monotonically increases with increasing doping level of Ca2+ into the Y3+ sites. The effect of chemical substitution of Ca2+ for Y3+ in (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 is to induce O 2p hole states in the CuO2 planes near the Fermi level which cause an increase of Tc from 15 K for x = 0.6 to 90 K for x = 0.3. Moreover, the generation of O 2p holes within the CuO2 planes is probably responsible for inducing a transition from a semiconductor to a superconductor.
AB - High resolution O K-edge X-ray-absorption near-edge-structure (XANES) spectra for the series of new Hg-based Sr-containing 1212-typed (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 superconductors (x = 0.3 ∼ 0.7) were measured using a bulk-sensitive total-X-ray-fluorescence-yield technique. Near the O 1s edge, the pre-edge peak with maxima at ∼ 528.3 eV is ascribed to transitions into O 2p holes located in the CuO2 planes. The intensity of this pre-edge peak monotonically increases with increasing doping level of Ca2+ into the Y3+ sites. The effect of chemical substitution of Ca2+ for Y3+ in (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 is to induce O 2p hole states in the CuO2 planes near the Fermi level which cause an increase of Tc from 15 K for x = 0.6 to 90 K for x = 0.3. Moreover, the generation of O 2p holes within the CuO2 planes is probably responsible for inducing a transition from a semiconductor to a superconductor.
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U2 - 10.1016/S0921-4534(97)00597-2
DO - 10.1016/S0921-4534(97)00597-2
M3 - Article
AN - SCOPUS:0031212098
VL - 282-287
SP - 961
EP - 962
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - PART 2
ER -