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Investigation and Application of Ultrafast Photoresponse of YBa_2Cu_3O_{7-δ} Microbridges, Excited by High Fluence Optical Pulses

100%
Jukna A.
Acta Physica Polonica A
|
2005
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vol. 107
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issue 2
230-234
EN
Ultrafast photoresponse of dc-biased optically-thick YBa_2Cu_3O_{7-δ} microbridges at T
2
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The Electromotive Force Dependence on the Polycrystalline Silicon Solar Cell Illuminance

51%
Jukna A., Miškinis P., Valuntaitė V., Bogdanovičius A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 6
1711-1716
EN
The impact of illuminance on changes of the solar cell electromotive force is analyzed. A mathematical model for a solar cell electromotive force dependence on illuminance is presented. For this purpose, a selection of experimental data trend function was carried out, and the Pearson correlation coefficients were established. The most optimal results were obtained in case of an exponential function with the strongest correlation (R^2=0.983). The analysis has shown that at 100 W/m^2 illuminance the electromotive force saturation is obtained (the electromotive force changes insignificantly and fluctuates at around 2 V), which indicates that upon reaching such an illuminance a solar cell operates at maximum efficiency. A first-order differential equation satisfied by the trend function has been compiled. When interpreting illuminance as an evolution variable, the proposed mathematical model can be interpreted as a dynamical system. The deviation frequency spectrum of the measurement values with respect to the theoretical prediction is analyzed.
3
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Easy Vortex Motion in an Artificial Channel of YBa_2Cu_3O_{7-δ} Superconducting Films

39%
Jukna A., Barboy I., Jung G., Abrutis A., Li X., Wang D., Sobolewski R.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
959-962
EN
Quasi-Josephson effect produced by a coherent vortex motion in the horizontal part of the laser-performedΠ-shaped channel of a YBa_2Cu_3O_{7-δ} superconducting bridge was investigated by means of electric transport measurements. We observed that in our structures, in a limited range of temperatures and bias currents, the vortices were confined in the channel only and moved coherently with the velocity of 3×10^4 m/s. The corresponding current-voltage characteristics of the bridge exhibited Josephson-like voltage steps with the amplitude dependent on temperature, but independent of the bias current.
4
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Investigation Details of Vortex Density in Laser-Written Π-Shaped Channel of YBCO Bridge by Means of I-V Dependences

33%
Steponaviciene L., Sulcas J., Jukna A., Jung G., Plausinaitiene V., Abrutis A., Maneikis A., Gong M., Sobolewski R.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
180-182
EN
A current-self-induced magnetic field H_{j}, such that H_{c1} < H_{j} < H_{c2} at T < T_{c}, penetrates a thin-film, type-II superconductor forming the Abrikosov magnetic vortex-antivortex pairs in the film's areas of weakest superconductivity. Our atomic force microscopy and scanning tunneling microscopy images confirm that in 50 μm wide, 100 μm long and 0.3 μm thick YBa_2Cu_3O_{7 - x} superconducting devices magnetic flux penetrates first into a 5 μm wide, Π-shaped and partially deoxygenated (x ≈ 0.2) channel for easy vortex motion. When the Lorentz force overcomes pinning force in the channel, the flux starts to move and its drift dissipates energy inducing dc voltage. This work reports on the density of coherently moving vortices along the channel vs. temperature in range from 0.93T_{c} to 0.97T_{c}. Our simulations show that the vortex density vs. temperature dependence extracted from I-V measurements of our devices follows the temperature dependence of magnetic field penetration depth and the coherence length of the superconductor.
5
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Current Distribution in Y-Ba-Cu-O Superconducting Microbridges Containing Π-Shaped Channel for Easy Vortex Motion

33%
Sulcas J., Steponaviciene L., Jukna A., Jung G., Plausinaitiene V., Abrutis A., Gong M., Sobolewski R.
Acta Physica Polonica A
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2011
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vol. 119
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issue 2
183-185
EN
A mixed state in dc-biased thin films of II-type superconductors realizes the Abrikosov magnetic vortices/antivortices, which are the result of the current-self magnetic field penetration into the film at temperatures lower than its critical temperature T_{c}. A nucleation of vortices/antivortices at the superconducting film's edges, their motion perpendicular to the direction of biasing current, and the annihilation in the film's center originates from a current dissipation in the superconductor and expresses itself in experiments as a dc voltage. This work reports on the results of simulation of current density in a 50 μm wide, 100 μm long, and 0.3 μm thick YBa_2Cu_3O_{7 - x} microbridges containing Π-shaped 5 μm wide single channel of easy vortex motion fabricated by means of laser-writing technique. Analyzing a two-dimensional-net of resistors and assuming that, due to the Meissner-Ochsenfeld effect, the magnetic flux penetration into superconducting film is nonlinear, we demonstrate that presence of a Π-shaped channel causes a non-homogeneous distribution of current in the microbridge.
6
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Dynamics of Hotspot Formation in Nanostructured Superconducting Stripes Excited with Single Photons

27%
Jukna A., Kitaygorsky J., Pan D., Cross A., Perlman A., Komissarov I., Sobolewski R., Okunev O., Smirnov K., Korneev A., Chulkova G., Milostnaya I., Voronov B., Gol'tsman G.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
955-958
EN
Dynamics of a resistive hotspot formation by near-infrared-wavelength single photons in nanowire-type superconducting NbN stripes was investigated. Numerical simulations of ultrafast thermalization of photon-excited nonequilibrium quasiparticles, their multiplication and out-diffusion from a site of the photon absorption demonstrate that 1.55 μm wavelength photons create in an ultrathin, two-dimensional superconducting film a resistive hotspot with the diameter which depends on the photon energy, and the nanowire temperature and biasing conditions. Our hotspot model indicates that under the subcritical current bias of the 2D stripe, the electric field penetrates the superconductor at the hotspot boundary, leading to suppression of the stripe superconducting properties and accelerated development of a voltage transient across the stripe.
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