All-MgB2 Josephson tunnel junctions

作者：Ueda K^*; Saito S; Sernba K; Makimoto T; Naito M

来源：Applied Physics Letters, 2005, 86(17): 172502.

DOI：10.1063/1.1920411

Sandwich-type all-MgB2 Josephson tunnel junctions (MgB2/AlOx/MgB2) have been fabricated with as-grown MgB2 films formed by molecular-beam epitaxy. The junctions exhibit substantial superconducting current (IcRN product similar to 0.8 mV at 4.2 K), a well-defined superconducting gap (Delta = 2.2-2.3 mV), and clear Fraunhofer patterns. The superconducting gap voltage of Delta agrees well with the smaller gap in the multigap scenario. The results demonstrate that MgB2 has great promise for superconducting electronics that can be operated at T similar to 20 K.

• 出版日期2005-4-25