New superconducting phase of Sr2CuO2+Cl2-y with 0201-type structure synthesized under high pressure

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K2NiF4-type Sr2CuO2+Cl2–y superconductor was synthesized with partial substitution of oxygen for apical chlorine using a high-pressure technique. This phase has been studied by transmission electron diffraction, convergent beam electron diffraction, x-ray powder diffraction, energy dispersive analysis of x-ray, electron energy loss spectroscopy and high-resolution electron microscopy. The crystal structure with a space group of I4/mmm has been determined, and the lattice parameters are obtained as a = b = 0.394nm and c = 1.564nm. Edge dislocations with Burgers vector &b=\frac {1}{2} c ; are observed in the phase.

Document Type: Research Article


Publication date: June 1, 2005

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