TY - JOUR
T1 - Superconductivity up to 32 K in a new family of the Hg-containing (Pb, Hg) (Sr, La)2CuO5-δ (1201) system
AU - Liu, R. S.
AU - Shy, D. S.
AU - Hu, S. F.
AU - Jefferson, D. A.
N1 - Funding Information:
The authorsw ould like to thank the Ministry of Economic Affairs of the Republic of China for financial support. One of us (SFH) also thanks the financial support from the Girton College (Cambridge) and CambridgeO verseasT rust.
PY - 1993/11/1
Y1 - 1993/11/1
N2 - A new family of superconductors with a maximum Tc of 32 K were observed in the Hg-containing (Pb0.5Hg0.5) (Sr2-xLax) CuO5-gd (1201) system for the composition range 0.8 ≤x≤ 1.0. The chemical composition and crystal structure of this system have been investigated by X-ray powder diffraction including the Rietveld refinement, electron diffraction, and high-resolution transmission electron microscopy. We have identified the phase responsible for the superconductivity to be similar to (Pb, Cu) (Sr, La)2CuO5 or (Ti, Pb) (Sr, La)2CuO5 (the so-called 1201 phase) with a space group of P4/mmm and lattice constants of a=3.7908(2) A ̊ and c=8.6915 (6) A ̊ for the x=0.8 sample in (Pb0.5Hg0.5 (Sr2-xLax)CuO5-δ. The disordering of the hole reservoir layer of (Pb, Hg)O due to the displacement of the oxygen ion from its ideal position (0.5, 0.5, 0) to (0.33, 0.5, 0) was found by Rietveld refinement for powder X-ray diffraction data of the x=0.8 sample. This displacement may give rise to the appearance of the superlattice spots along the [102]* direction with a modulation factor close to 4 in the electron diffraction pattern viewed down [010].
AB - A new family of superconductors with a maximum Tc of 32 K were observed in the Hg-containing (Pb0.5Hg0.5) (Sr2-xLax) CuO5-gd (1201) system for the composition range 0.8 ≤x≤ 1.0. The chemical composition and crystal structure of this system have been investigated by X-ray powder diffraction including the Rietveld refinement, electron diffraction, and high-resolution transmission electron microscopy. We have identified the phase responsible for the superconductivity to be similar to (Pb, Cu) (Sr, La)2CuO5 or (Ti, Pb) (Sr, La)2CuO5 (the so-called 1201 phase) with a space group of P4/mmm and lattice constants of a=3.7908(2) A ̊ and c=8.6915 (6) A ̊ for the x=0.8 sample in (Pb0.5Hg0.5 (Sr2-xLax)CuO5-δ. The disordering of the hole reservoir layer of (Pb, Hg)O due to the displacement of the oxygen ion from its ideal position (0.5, 0.5, 0) to (0.33, 0.5, 0) was found by Rietveld refinement for powder X-ray diffraction data of the x=0.8 sample. This displacement may give rise to the appearance of the superlattice spots along the [102]* direction with a modulation factor close to 4 in the electron diffraction pattern viewed down [010].
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U2 - 10.1016/0921-4534(93)90066-Y
DO - 10.1016/0921-4534(93)90066-Y
M3 - Article
AN - SCOPUS:0027694516
SN - 0921-4534
VL - 216
SP - 237
EP - 242
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 3-4
ER -