Comparative study of flux creep in Bi2Sr2CaCu2Ox and YBa2Cu3Oy single crystals

✍ Scribed by S.N. Barilo; V.I. Gatalskaya; A.P. Ges; P.V. Grizkov; L.A. Kurochkin; S.L. Kurochkin; A.A. Ignatenko; L.A. Kurnevich

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 251 KB
• Volume: 33
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(93)90063-t

✦ Synopsis

The relaxation of diamagnetic magnetization in Bi2Sr2CaCu20 x and YBa2Cu30 v 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 Uo is found to be = 10-15 meV (T < 20 K) and 110-130 meV (T > 20 K) for the bismuth crystal. For the yttrium crystal Uo = 100-120 meV at T_< 70 K. These results are discussed in terms of the thermally activated flux motion model.