The Low-Field Ac Impedance of YBa2Cu3O7-δ Superconducting Slab |
| P.O. Aleksyeyeva,b and E.M. Reusenblattb
aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland, bDonetsk Physico-Technical Institute, Ukrainian Academy of Sciences, 72 R. Luxemburg str., 83114, Donetsk, Ukraine |
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| Received: 04 09 2006; |
| Using results of surface impedance measurements, the penetration of ac field into a melt-textured YBa2Cu3 O7-δ slab was investigated. We obtained a linear correlation between the surface impedance and ac frequency. The impedance curve shifts towards higher temperatures - 0.9 K per decade of the frequency increase, for dc magnetic field μ0Hdc≤8×10-3 T. This is an evidence of thermally activated flux creep. A plateau in the temperature dependence of the real impedance part was observed at approximately 88 K. |
| DOI: 10.12693/APhysPolA.111.99 PACS numbers: 74.25.Qt, 74.70.Ad |