Abstract
Superconducting crystals ( T c=88 K) of the `1201' mercury cuprate have been grown by using vanadium as stabilizer of the (HgO δ ) mercury layer. Its shortened c-axis parameter, c=9.345 Å, is linked to the substitution of small VO 4 tetrahedra for HgO 2 stick deduced from the structural study. The regular layer stacking is confirmed by high resolution microscopy, and cationic analysis coupled to an electron microscope leads to the average formula Hg 0.75V 0.25Ba 2CuO 4+ δ for these overdoped crystals in good agreement with the structural refinements. One of the major result of the structural part is the mobility of oxygens located at the [BaO] ∞ layer level. The superconducting properties of crystals with typical 800×500×10 μm 3 dimensions have been investigated by magnetic measurements. Well-marked fishtail features are exhibited on their M( H) curves. The corresponding second peak line differs from that of optimized 1201 crystals demonstrating the important consequences on the superconducting properties of the vanadium for mercury substitution.
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