Current-induced voltage oscillations in superconducting Y1Ba2Cu3O7-δ

Slow voltage oscillations in Ag-doped superconducting Y–Ba–Cu–O

“…The experiments performed by Gordeev et al [2,3] demonstrated that the asymmetrical square wave currents cause slow voltage oscillations on long time scale in de-twinned single crystalline of Y 1 Ba 2 Cu 3 O 7Àx (YBCO) sample. A similar study on polycrystalline sample of YBCO has been reported by Kilic et al by using bidirectional symmetric square wave current [4]. It has been observed that the regular sinusoidal-type oscillations evolve in a well-defined range of amplitudes and periods of drive, and temperature.…”

“…As is well known, addition of Ag into the superconducting matrix improves the grain boundaries and also causes an increase in the normal state and superconducting properties of the corresponding material [10][11][12]. In a recent paper, we showed that the voltage oscillations in undoped YBCO take positive values with a background voltage value despite the fact that the driving current is bidirectional [4]. Therefore, we attribute the symmetry in voltage oscillations to the presence of Ag along the grain boundaries.…”

Analysis of Observed Voltage Oscillations in Silver Doped High Temperature Superconductor YBCO

“…The regular voltage oscillations, without observation of any instability (i.e., voltage jumps or drops) or noise, evince for the formation of this ordered state. The voltage response associated with voltage oscillations lies typically in the range of 10 −6 -10 −7 V [2,5,8].…”

“…Experimental results brought out that the flux lines by variation of the current cause different motional redistribution in the superconductors [1][2][3][4][5][6]. Fast Fourier transform (FFT) measurements were done by square wave currents which showed that the driven current is re-organized to vortices [1].…”

“…In order to observe the periodic oscillations in response, the asymmetric current pulses are essential feature in producing such instabilities. In our case, one of the major conditions to observe periodic voltage oscillations in the V -t curves is to apply symmetric square wave current to the sample [3,5,9].…”