| Autor: |
S. L. Kurochkin, P. V. Grizkov, L. A. Kurochkin, A.A. Ignatenko, Sergei N. Barilo, A. P. Ges, V. I. Gatalskaya, L.A. Kurnevich |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Cryogenics. 33:375-377 |
| ISSN: |
0011-2275 |
| DOI: |
10.1016/0011-2275(93)90063-t |
| Popis: |
The relaxation of diamagnetic magnetization in Bi 2 Sr 2 CaCu 2 O x and YBa 2 Cu 3 O y single crystals is studied in the temperature range 4.2 – 80 K in the magnetic field H = O, after the crystals have been subjected to fields of 2.5 and 6 T, respectively. The external magnetic field was perpendicular to the a – b plane of the crystals. The remanent magnetization M r in both crystals is found to decrease logarithmically with time t (with the exception of the results in the temperature range 20 – 25 K for the bismuth crystal). The activation energy for motion of flux lines U o is found to be − 10 – 15 meV ( T T > 20 K) for the bismuth crystal. For the yttrium crystal U o ≈ 100 – 120 meV at T ≤ 70 K. These results are discussed in terms of the thermally activated flux motion model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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