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1
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The Influence of Fast Neutron Irradiation on the Magnetostriction of Ceramic YBa_2Cu_3O_{7-δ} Sample

100%
Nabiałek A., Vasiliev S., Pytel B., Chabanenko V., Piechota S.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
739-744
EN
We investigated the magnetostriction of ceramic YBa_2Cu_3O_{7-δ} sample both before and after fast neutron irradiation with the fluency of 7.55×10^{17} n/cm^2 and energy of above 0.5 MeV. We have found that after irradiation the widths of both transverse and longitudinal magnetostriction hysteresis loops at a given temperature and at a given external magnetic field increased several times. At 4.2 K and in 10 tesla the widths of the magnetostriction hysteresis loop of the irradiated sample are of an order of 10^{-5}. The results can be understood in the framework of the model of the magnetostriction induced by the pinning forces, assuming the stress in the sample to be induced mainly by the intragrain screening currents.
2
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Moderation of the Flux Jumps Dynamics by Eddy-Currents in a Disk Shape NbTi Superconductor

86%
Vasiliev S., Chabanenko V., Nabiałek A., Rusakov V., Piechota S., Szymczak H.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
777-783
EN
We studied the moderation of the flux jumps dynamics in a disc shape NbTi-50% superconductor caused by eddy-currents induced in two copper cylinders attached to both surfaces of the investigated sample. We investigated experimentally the time of the flux jump duration, amount of the magnetic flux entering the sample during the jump as well as the fine structure of the jumps as a function of temperature and the external magnetic field. A simple theoretical model, which describes the magnetic field dependence of the amount of the magnetic flux entering the superconducting sample during the flux jump, was developed.
3
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The Structure of Thermomagnetic Avalanches in Superconducting Disc of NbTi

86%
Vasiliev S., Nabiałek A., Chabanenko V., 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
661-668
EN
We investigated dynamics of giant flux jumps, caused by thermomagnetic avalanches, in superconducting disc of conventional NbTi-50% superconductor. We studied surface magnetization, as well as changes of magnetic flux in the superconducting sample and in the area around it. The influence of the magnetic history on the flux jumps structure was investigated. The most complex structure of the flux jumps was found during sample remagnetization. The comparison between dynamic changes of the magnetic flux in the sample and in the area around it shows that, at the last stage of the thermomagnetic avalanche, a process of magnetic flux redistribution in the superconductor's volume occurs. This process is not accompanied by an entrance of additional flux lines into the superconductor's volume.
4
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The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor

86%
Nabiałek A., Piechota S., Szymczak H., Vasiliev S., Chabanenko V., Rusakov V.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
235-241
EN
We investigated giant flux jumps, caused by thermomagnetic avalanches, in two cylindrical samples of conventional NbTi-50% superconductor of the same diameter -- 14 mm, but of different heights -- 4 mm and 20 mm. We studied the influence of demagnetizing effects on the flux jumps occurrence, the amount of the magnetic flux entering the sample during the following jumps and on the flux jumps dynamics. The dynamics of the magnetic flux entering the sample is compared with the dynamics of the stray field.
5
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The Influence of Magnetic History on the Stability of Critical State and the Dynamics of Flux Jumps in Conventional NbTi Superconductor

86%
Nabiałek A., Vasiliev S., Chabanenko V., Perez-Rodriguez F., Piechota S., Szymczak H.
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issue 2
343-345
EN
We studied the influence of magnetic history on the stability of critical state and the dynamics of flux jumps in conventional NbTi superconductor. We have found that both the stability of critical state and the dynamics of flux jumps are strongly influenced by the magnetic history and by the magnetic field distribution induced within the sample by preceding jumps. This magnetic field distribution can be particularly complex in the region of the hysteresis loop where the external magnetic field changes its sign (region of remagnetization), because of demagnetizing effects. For this reason, the most complex structure of the flux jumps is observed in the third quadrant of magnetization hysteresis loop. Flux jumps observed in the region of remagnetization have different dynamics in comparison to the jumps observed in other regions of the magnetization hysteresis loop. Duration of these jumps is usually significantly longer than others, and their structure is more complex.
6
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Giant Magnetostriction Jumps in Conventional NbTi Superconductor

86%
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.
7
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Oscillating Dynamics and Trajectory of the Single Vortex Line

86%
Rusakov V., Vasiliev S., Chabanenko V., Yurov A., Nabiałek A., 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
641-646
EN
The De Gennes and Matricon problem of finding the spectrum of oscillations of massive vortex line under the action of pinning and viscosity forces is solved. The obtained vibration spectrum of the vortex is discussed and the role of each contributing force is elucidated. The trajectory of the vortex motion is calculated and illustrated.
8
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Size Effect in Impedance of Nb_3Al Superconductor

73%
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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