Josephson Effect in MgB2: Large IcRlN Product and Superconducting Energy Gap

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（9）
• 所属期刊栏目: CONDENSED MATTER:ELECTRONIC STRUCTURE, ELECTRICAL,
• 页码范围: 1254-1255
• 页数: 2页
• 分类号: O4
• 语种: 英文

摘要

We report on the observation of the Josephson effect on the newly discovered superconductor MgB2 with the breakjunction technique. Similar to conventional superconductors, the I - V curve can be fitted with the resistively shunted junction model including the noise effect, and a large characteristic voltage Vc = IcRN = 9.6meV was obtained. The energy gap determined by the Ambegaokar-Baratoff relation with the fitted Vc is very consistent with the Bardeen-Cooper-Schrieffer weak-coupling value. Our result implies that the superconductor MgB2 is a promising material for Josephson device applications.