Giant Oscillations of the Magnetic Induction 
at the Surface of Textured YBaCuO+10% BaSnO3 Plate 
as a Result of Flux Jumping

V.V. Chabanenko1, S. Vasiliev2, A. Nabialek2, H. Szymczak2, 
S. Piechota2, V.F. Rusakov3, E.M. Roizenblat 4

1 Physico-Technical Institute NAS, 83114 Donetsk, 72 R. Luxemburg str., Ukraine
2 Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 0-668 Warsaw, Poland
3 Donetsk National University, 83055, Donetsk, 24 Universitetskaya str., Ukraine
4 Research Institute of Materials and Electronic Engineering, 83036 Donetsk, Ukraine

The low-damping oscillations of the surface induction Bsurf vs time t with giant amplitude (it is better than the value of flux jump BFJ, see figure) in textured YBaCuO superconductors are observed. The structures of the flux jumps were investigated using a miniature Hall probe sensor [1]. It was placed in the centre of the sample surface. One can examine the Hall sensor voltage directly in the transient recorder [2]. The size of the sample is 16,6x2.2x5.7mm3. Magnetic field was directed along the small size side of the sample. The excitation of these oscillations in YBaCuO+10% BaSnO3 plate in the mixed state is a result of giant avalanches of the magnetic flux occurring due to the development of the thermomagnetic instability. Such oscillations contain some information about the vortex matter in the liquid phase. 

[1] O.A. Mironov, S.V. Chistyakov, I.Yu. Skrylev, et.al. Industrial Laboratory 56 1010 (1991).
[2] V.V. Chabanenko, V.F. Rusakov, V.A. Yampolskii, S. Piechota, A. Nabialek, S. Vasiliev, H. Szymczak, arXiv:cond-mat/0106379 v2 11 Mar  2002.