Superconductivity above 130K in the Hg-Ba-Ca-Cu-O system

Article Abstract:

The prospect of establishing distinctly higher transistion temperature than previously achieved for superconductivity to occur is improving. Recent discovery fix the transition temperature to 94K in a Hg-Ba-Cu-O system comprising copper oxide planes in layered materials. Substitution of bismuth and thalium in place of mercury increased the transition temperature. The Hg-Ba-Ca-Cu-O system upped the transition temperature to 130K in an ordered superstructure of a specific sequence of unit cells. Magnetic and resistivity measurements verify the 130K transition temperature as achievable.

Transition temperature, Transition temperatures (Thermodynamics)

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Drying transition of confined water

Article Abstract:

Experiments are conducted to show that rough hydrophobic surfaces could experience attractive forces over distances more than 30 timed greater than previously reported, due to the spontaneous evaporation of the intervening, confined water, thereby emphasizing the importance of surface roughness in the interaction of extended structures in water. Findings reveal that long-range hydrophobic interactions, the length of which extends to micrometre scales for rough surfaces, is due to the evaporation or 'cavitation' of the water at tip-to-substrate separations.

United States, Protein folding, Hydrophobic effect

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An explanation for a universality of transition temperatures in families of copper oxide superconductors

Article Abstract:

Bell-shaped curve is calculated to show that, if materials can be engineered to minimize the charge imbalance the high-transition-temperature can be raised. A remarkable feature of copper oxide high- transition-temperature superconductors is shown.

Properties

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