| Автор | D R Watson |
| Автор | J E Evetts |
| Дата выпуска | 1996-04-01 |
| dc.description | The application of bulk high-temperature superconductors (HTSs) in power engineering systems requires the development of reliable contact preparation technology and a thorough understanding of the current transfer and voltage characteristics of the HTS - normal metal interface. This article describes a technique for preparing in situ Au electrical contacts to (Bi-2212) bulk superconductors and a method for measuring the spatial dependence of voltage and current in a contact. Currents of approximately 70 A (the of the sample) transfer from the contact metal to Bi-2212 over a surface area of . An expression for the spatial dependence of voltage and current in a contact is derived and discussed in the context of semiconducting devices, LTSs and HTSs. The surface resistivity of the Au - Bi-2212 interface is measured at and it is demonstrated that an anisotropic critical current density significantly increases the apparent surface resistivity by as much as a factor of 10 in the region where current first transfers to the HTS. Modified expressions for the spatial dependence of voltage and current in contacts are given which account for surface and flux flow resistive components. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Electrical contacts to CRT Bi-2212 superconductors: preparation, characterization and analysis |
| Тип | paper |
| DOI | 10.1088/0953-2048/9/4/011 |
| Electronic ISSN | 1361-6668 |
| Print ISSN | 0953-2048 |
| Журнал | Superconductor Science and Technology |
| Том | 9 |
| Первая страница | 327 |
| Последняя страница | 332 |
| Аффилиация | D R Watson; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK; IRC in Superconductivity, West Cambridge Site, Madingley Road, Cambridge CB3 0HE, UK |
| Аффилиация | J E Evetts; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK; IRC in Superconductivity, West Cambridge Site, Madingley Road, Cambridge CB3 0HE, UK |
| Выпуск | 4 |
