Superconductivity at 94K in HgBa2CuO4+gamma
Article Abstract:
The method for synthesis of a new superconductor HgBa2CuO4+gamma is presented. Preparation was done using solid state reaction between Ba2CuO3+gamma and HgO. X-ray powder analysis, scanning electron microscopy and alternating-current magnetic susceptibility measurements were used to observe the qualities and structure of the sample. The new substance is similar in structure to Tl-layer materials but has more technological potential due to the small distances in CuO2 layers.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Scaling of transition temperature and CuO(sub2) plane buckling in a high-temperature superconductor
Article Abstract:
A 123 structure is used to study correlations between structure and Tc in a compound where both the under-doped and over-doped regimes can be accessed. A clear scaling between Tc and the buckling of copper oxide planes is observed, with both undergoing a maximum at the same oxygen composition, indicating a common origin. The structure is believed to distort to lower its free energy when the Fermi energy passes through the peak density.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Discovery of a second family of bismuth-oxide-based superconductors
Article Abstract:
BaPbsub1-xBixOsub3 is a superconducting oxide with a high transition temperature, in spite of relatively low density Fermi level states. The synthesis of a second family of superconducting bismuth oxides, based on SrBiOsub3 is reported. Superconductivity is shown to be induced by partial substitution of potassium or rubidium for strontium.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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