Current-limiting mechanisms in individual filaments extracted from superconducting tapes

Article Abstract:

Several large-scale high-temperature superconductor applications rely on achieving high critical-current densities Jc. Silver-sheathed BSCCO tapes have Jc values within around 25% of the target, but they are restricted by supercurrent barriers over many length scales. The nature of the barriers has been elucidated from measurements of the transport properties of individual filaments from high Jc multifilament tapes. The results show that better processing methods to improve the c-axis alignment should increase accessible Jc values.

Observations, Superconducting devices, Superconductive devices, High temperature superconductivity

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Epitaxial diamond growth on sapphire in an oxidizing environment

Article Abstract:

The thin-film technique has been used as a pulsed laser deposition process where a pulsed ultraviolet (UV) excimer laser is used to ablate a solid target, to provoke highly excited vapour species transported onto substrate. Diamond growth was achieved under conditions where the carbonoxidative etching has to compete with its deposition. The choice of temperature range was important in preferential oxidation of non-diamond carbon species to that of diamond.

Diamonds, Thin films

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Epitaxial diamond polytypes on silicon

Article Abstract:

It is possible to use ion beams to nanonstructure various diamond polytypes, epitaxially aligning them to a silicon substrate. This work should allow new carbon and non-carbon materials to be nanostructured for a wide range of applications.

Ion bombardment, Ion beam irradiation

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