Superconductivity in CVD Diamond Thin Film Well-Above Liquid Helium Temperature

Details Superconductivity in CVD Diamond Thin Film Well-Above Liquid Helium Temperature Superconductivity in CVD Diamond Thin Film Well-Above Liquid Helium Temperature

2004-06-02

arxiv.org/abs/cond-mat/0406053v2

Appl. Phys. Lett. 85, 2851 (2004)

Physics

Condensed Matter

Superconductivity

6 pages, 3 figures

Scientific paper

10.1063/1.1802389

Diamond has always been adored as a jewel. Even more fascinating is its outstanding physical properties; it is the hardest material known in the world with the highest thermal conductivity. Meanwhile, when we turn to its electrical properties, diamond is a rather featureless electrical insulator. However, with boron doping, it becomes a p-type semiconductor, with boron acting as a charge acceptor. Therefore the recent news of superconductivity in heavily boron-doped diamond synthesized by high pressure sintering was received with considerable surprise. Opening up new possibilities for diamond-based electrical devices, a systematic investigation of these phenomena clearly needs to be achieved. Here we show unambiguous evidence of superconductivity in a diamond thin film deposited by a chemical vapor deposition (CVD) method. Furthermore the onset of the superconducting transition is found to be 7.4K, which is higher than the reported value in ref(7) and well above helium liquid temperature. This finding establishes the superconductivity to be a universal property of boron-doped diamond, demonstrating that device application is indeed a feasible challenge.

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