Superconductivity of Heavily Boron-Doped Diamond and Ultrananocrystalline Diamond.

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The purpose of this study is to investigate the possibility as superconductive materials of boron doped ultrananocrystalline diamond (UNCD) thin films. The electrical conductivity of the boron doped UNCD was measured at the range of from 500K to 3.6K. We confirmed that the electrical conductivity of UNCD increased with the amount of doped boron, and the value was not possible to measure at the temperature of below 110K because of flaking of the ohmic electrode on the film surface of the boron doped UNCD. The adhesion strength of between the ohmic electrode and the boron doped UNCD thin films might be different depending on the value of measurement temperature. It is necessary to search for the electrode material that has high adhesion to film surface of boron doped UNCD. Through the solution of this problem, we estimate that the superconductive property of boron doped UNCD became apparent. We continue this study.