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Superconductivity in polycrystalline diamond thin films |
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| Authors: | Yoshihiko Takano Masanori Nagao Tomohiro Takenouchi Hitoshi Umezawa Isao Sakaguchi Masashi Tachiki Hiroshi Kawarada |
| Affiliation: | aNational Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 Japan;bSchool of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan;cAdvanced Industrial Science and Technology, 1-1-1, Umezono, Tsukuba 305-8568, Japan |
| Abstract: | Superconductivity was discovered in heavily boron-doped diamond thin films deposited by the microwave plasma assisted chemical vapor deposition (MPCVD) method. Advantages of the MPCVD deposited diamond are the controllability of boron concentration in a wide range, and a high boron concentration, especially in (111) oriented films, compared to that of the high-pressure high-temperature method. The superconducting transition temperatures are determined to be 8.7 K for Tc onset and 5.0 K for zero resistance by transport measurements. And the upper critical field is estimated to be around 7 T. |
| Keywords: | Boron-doped diamond Superconductivity Semiconductivity (111) orientation Metal-insulator transition |
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