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1
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The Low-Field Ac Impedance of YBa_2Cu_3O_{7-δ} Superconducting Slab

100%
Aleksyeyev P., Reusenblatt E.
Acta Physica Polonica A
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2007
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vol. 111
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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.
2
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Dynamics of Thermomagnetic Avalanches in Melt-Textured YBaCuO Superconductors

81%
Nabiałek A., Vasiliev S., Aleksyeyev P., Chabanenko V.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
153-158
EN
We investigated dynamics of the thermomagnetic avalanche development in melt-textured samples of the oxide YBaCuO high temperature superconductor. We found that the flux jumps, caused by the thermomagnetic instabilities, are accompanied by giant convergent oscillations of the surface induction. These results are compared with the dynamics of the flux jumps in other type-II superconductors, including conventional NbTi and oxide high temperature Bi _2Sr_2CaCu_2O_{8+δ} superconductor, and discussed in the framework of the available model of the thermomagnetic avalanche development.
3
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Giant Magnetostriction Jumps in Conventional NbTi Superconductor

61%
Nabiałek A., Vasiliev S., Chabanenko V., Aleksyeyev P., Rusakov V., Piechota S., Szymczak H.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
633-639
EN
Magnetostriction of a large slab of conventional NbTi superconductor, with a diameter of about 6 mm, was investigated by the strain gauge technique. At the temperature of 4.2 K and in the external magnetic field of several T we found irreversible magnetostriction of an order of 10^{-5}, where the number means the relative changes of the slab diameter. This large magnetostriction is accompanied by giant magnetostriction jumps, caused by thermomagnetic avalanches. These thermomagnetic avalanches also cause giant jumps of the surface magnetization, which can be observed by using the Hall probes. The results were analyzed in the framework of the pinning induced magnetostriction model.
4
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Size Effect in Impedance of Nb_3Al Superconductor

52%
Aleksyeyev P., Nabiałek A., Vasiliev S., Rusakov V., Chabanenko V., Zalutskii M., Piechota S., Szymczak H., Kodess B.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
555-559
EN
We present the results of the impedance measurements in Nb_3Al superconducting polycrystalline alloy vs. temperature and magnetic field. Using these results and applying the size effect model we calculate the flux-flow conductivity of the Nb_3Al superconducting alloy near its critical temperature.
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