Magnetic flux relaxation of epitaxial YBa2Cu3O7-δ films at low temperatures.

✍ Scribed by J. Lensink; C.F.J. Flipse; J. Roobeek; R. Griessen; B. Dam

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 140 KB
• Volume: 162-164
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)91198-2

✦ Synopsis

In this paper we present magnetic flux relaxation measurements as well as temperature and field dependent critical current Jc measurements on epitaxial coevaporated films of YBa2Cu3OT.8 superconductor. We measured a critical current of 3.5 * I011 A/m 2 at 4.2 K and 1.3 * 1010 A/m 2 at 77 K. Je depends strongly on the magnetic field B for B applied perpendicularly to the surface. The magnetization relaxation M(t) is logarithmic in time. In contrast to single crystals and polycrystalline samples the normalized magnetization relaxation tends towards a constant value at low temperatures and is weakly field-dependent.