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

Altinkok, A.; Yetiş, H.; Kılıç, Kıvılcım; Kiliç, A.; Olutaş, Murat

doi:10.1016/j.physc.2008.05.131

Cited by 3 publications

(5 citation statements)

References 13 publications

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“…This dynamic instability was explained in terms of the pinning-depinning mechanism and the elasticity of the vortex lattice. In a superconducting polycrystalline sample of Y 1 Ba 2 Cu 3 O 7Àx , the effects of the type of the transport current modulations on the transport measurements were also reported by Kiliç et al 29,30 They observed that sinusoidal-type voltage oscillations appear during the time evolution of the sample voltage for BSW currents in well-defined ranges of amplitudes and periods of the drive and temperature. The non-linear voltage response was attributed to the defective flow of the current-induced self-magnetic flux (SMF) lines in a multiply connected network and semi-elastic coupling between the SMF lines and pinning centers.…”

Section: Introductionsupporting

confidence: 53%

“…Another important factor which influences the vortex dynamics is the type of the transport current modulation. 5,[23][24][25][26][27][28][29][30] Henderson et al 5 showed that there are three distinct regimes which depend on the type and frequency of applied transport current by performing fast transport measurements in a single-crystalline sample of superconductor 2 H-NbSe 2 : No measurable voltage for a dc current, growing of the voltage from zero to a high voltage value for a bidirectional square wave (BSW) current, and a decay in voltage for a dc current. These experimental observations prove that high vortex mobility appears for an alternating current, whereas no apparent vortex motion appears for direct a) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Organization of flux line system and voltage oscillations in superconducting MgB2

Kiliç

Olutaş

Kılıç

et al. 2011

Journal of Applied Physics

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The influence of bidirectional square wave (BSW) current on the evolution of the V-t curves was studied in a polycrystalline sample of MgB 2 . Regular sinusoidal-like voltage oscillations were observed at well-defined values of the amplitude (I BSW ) and period (P I ) of the BSW current, temperature, and external magnetic field. The voltage oscillations were interpreted mainly in terms of short-and long-range spatial correlations in a flux line system, relaxation effects, and the dynamic competition between pinning and depinning. The oscillating mode was also discussed in terms of sliding charge density waves associated with density fluctuations. Alternatively, the coupling between conventional thermally activated flux creep theory and annealing of the disordered states was considered as another possible mechanism in describing the voltage oscillations. Due to the complex interplay of pinning and driving forces, the oscillating mode is correlated to the drifting of flux lines, which are in motion, and it is assumed that the majority of flux lines try to traverse the sample, but do not leave it entirely. The symmetry in voltage oscillations was attributed to the equality between flux exit and entry along the sample edges. In this process, the majority of flux lines leave the sample and the direction of motion of flux lines reverses. During the oscillatory motion, we suggest that the interaction between flux lines and pinning centers may be elastic coupling in nature, because of rigidity of the flux line lattice in MgB 2 . Non-oscillatory behavior of V-t curves measured for BSW drive with low P I was attributed pre-dominantly to the effect of pinning on the distribution of the flux lines. The vortex capacitor model could be applied to explain the voltage decays in these V-t curves. However, the voltage decays associated with switching of I BSW to dc current (I dc ) were correlated to current-induced quenched disorder and to the glassy state relaxation. Further, angular dependence of voltage oscillations reveals that the anisotropic effects are nearly negligible on the evolution of V-t curves. It was shown that the voltage oscillations can be described well by an empirical expression V(t) $ sin(wt þ /), where w is the frequency and / is the phase angle. Finally, at well-defined values of I BSW and P I of BSW current, H, and T, it was argued that the MgB 2 sample behaves like a double-integrator.

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Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Organization of flux line system and voltage oscillations in superconducting MgB2

Kiliç

Olutaş

Kılıç

et al. 2011

Journal of Applied Physics

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“…Silver doped YBCO samples were prepared by the same solid state reaction method which was used in our previous works [3,10,11] to add 1% weight silver of amount of Cu into YBCO samples.…”

Section: Methodsmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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The effect of square wave current was investigated by the voltage-time (V -t curves) measurements at various external magnetic fields and periods (P ) in silver doped YBCO. The general sinusoidal behavior of V -t curves was mainly interpreted as a dynamic competition between driving and pinning forces. It is observed that as the period of square wave current is increased, the amplitude of oscillation is also increased. The observed oscillations in the voltage was fitted by an common sinusoidal equation V (t) ∼ sin(ωt + ϕ). It is also found that there is different phase angle ϕ values for each cycle. Fast Fourier transform measurements is applied to oscillation period (PI ) of the square wave current. The results give us that a physical mechanism is related with charge density waves. Intrinsically, in Ag doped YBCO, the pinned flux line system evokes the general behavior of charge density waves. Due to properties of the converting the square wave current to sinusoidal voltage oscillations, Ag doped YBCO sample can behave as double-integrator for the defined period, amplitude of square wave current and magnetic field values in time.

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Magnetovoltage Measurements and Hysteresis Effects in Polycrystalline Superconducting Y1Ba2Cu3O7−x /Ag in Weak Magnetic Fields

Altinkok

Kılıç

Olutaş

et al. 2013

J Supercond Nov Magn

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

Cited by 3 publications

References 13 publications

Organization of flux line system and voltage oscillations in superconducting MgB2

Organization of flux line system and voltage oscillations in superconducting MgB2

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

Magnetovoltage Measurements and Hysteresis Effects in Polycrystalline Superconducting Y1Ba2Cu3O7−x /Ag in Weak Magnetic Fields

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