Superconductivity at 80 K in (Sr,Ca)3Cu2O4+deltaCl2-y induced by apical oxygen doping
Article Abstract:
An alternative doping approach known as apical oxygen doping was developed for the copper oxyhalide family (Sr,Ca)3Cu2O4+deltaCl2-y to render it superconductive at 80 K. Holes were introduced by replacing certain portions of the monovalent halogen found on the apical sites with divalent oxygen. The introduction of charge carriers into the CuO2 planes is necessary to make such materials superconductive. A bulk superconductivity was obtained with Tc above 77 K in a new two-layer compound (Sr,Ca)3Cu2O4+deltaCl2-y. The compound is found to be isostructural with (La,Sr)2-CaCu2O6 with (Sr,Ca) at the (La,Sr) or Ca sites, and Cl at the apical sites outside the CuO2 planes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Negative lattice expansion from the superconductivity-antiferromagnetism crossover in ruthenium copper oxides
Article Abstract:
The mechanism of high-transition-temperature superconductivity and antiferromagnetism in doped copper oxides is examined. Layered ruthenium copper oxides, which were doped to the boundary of antiferromagnetism and superconductivity, showed negative thermal volume expansion.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Enhanced supercurrent density in polycrystalline YBa2Cu3O7-delta at 77K from calcium doping of grain boundaries
Article Abstract:
Research is presented concerning the production of cost-effective, practical superconducting power cables through the use of grain-boundary doping. The cables can function at liquid-nitrogen temperatures.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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