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  1. 1 Acta Physica Polonica A

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  1. 1 2007

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  1. 1 Aleksyeyev P.

  2. 1 Reusenblatt E.

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The Low-Field Ac Impedance of YBa_2Cu_3O_{7-δ} Superconducting Slab

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Aleksyeyev P., Reusenblatt E.
Acta Physica Polonica A
|
2007
|
vol. 111
|
issue 1
99-104
EN
Using results of surface impedance measurements, the penetration of ac field into a melt-textured YBa_2Cu_3 O_{7-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 fieldμ_0H_{dc}≤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.
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