Abstract
A study of the DC I-V curves of bifilar BSCCO/Ag tapes at 77 K is presented. Tapes under study were carrying DC transport current and exposed to external AC (0-20 mT, 50-400 Hz) or DC (0-20 mT) magnetic fields perpendicular to the plane of the tape. The measurements were carried out with bifilar tape to avoid the influence of the self-field. The measured I-V curves are well described by power law in the range of electric field 0.1-10 μV/cm. The AC field affects the I-V curves in a much stronger way than the DC field. The application of the AC field results in a linear decrease of the critical current (criterion 1 μV/cm) independent of the frequency of the magnetic field. The exponent n also exhibits a strong dependence on the AC magnetic field decreasing with increasing AC field amplitude and increasing with increasing frequency. The results are interpreted by assuming a confinement of the DC transport current in the central AC field free region of the tape. A low current density is assumed to flow in the region to which the AC magnetic field has penetrated.
| Original language | English |
|---|---|
| Pages (from-to) | 201-205 |
| Number of pages | 5 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 401 |
| Issue number | 1-4 |
| DOIs | |
| State | Published - 15 Jan 2004 |
| Event | Proceedings of the International Cryogenic Materials Conference - Enschede, Netherlands Duration: 25 May 2003 → 28 May 2003 |
Bibliographical note
Funding Information:This research has been partially supported by the Israel Ministry of National Infrastructures, R&D Department.
Funding
This research has been partially supported by the Israel Ministry of National Infrastructures, R&D Department.
| Funders | Funder number |
|---|---|
| Israel Ministry of National Infrastructures, R&D Department |
Keywords
- AC magnetic field
- BSCCO tape
- Critical current
- I-V curve
- Penetration field