%0 Journal Article %T Investigation into Superconducting Y-Ba-Cu-O Films Containing Regions of Weak Superconductivity and Biased at I >> IC Stiprios I >> IC elektros srov s tankio pasiskirstymas plonuose Y-Ba-Cu-O sluoksniuose, turin iuose silpnojo superlaidumo sritis %A Jonas £¿ulcas %A Art¨±ras Jukna %J Science ¨C Future of Lithuania %D 2011 %I Vilnius Gediminas Technical University %R 10.3846/mla.2011.122 %X Current distribution in YBa2Cu3O7-x superconducting thin film micro-bridges containing laser¨Cwritten -shaped channel for easy vortex motion have been investigated in a narrow range of temperatures ranging from 85.7 to 90.2 K, which are below the critical temperature Tc of the material. In the range of the before mentioned temperatures the current-self magnetic field produced, Abrikosov magnetic vortices/anti-vortices appear in the partially deoxygenated (x ~ 0.2) channel and move coherently identifying itself as Josephson¨Clike voltage ¡°steps¡± in nonlinear current¨Cvoltage dependences. Bias current creates Lorentz force FL, pushing vortices along the LW-channel from its edges towards the centre. As follows from current-voltage dependences, vortices start moving at I = Ic. This current already satisfies condition FL >> Fp (where Fp ¨C is pinning force in the film). Our results confirm that coherent vortex motion in the channel holds even at high biasing current when I ~ 200Ic. However, at these biasing currents, the width of voltage steps appears to be shorter than at lower current. This phenomenon has been explained by means of the onset of additional vortex motion in the laser untreated regions of the superconducting device. These regions are located in between the ¦°-shaped channel for easy vortex motion. Our results also demonstrate the possibility of investigating the electric properties of the mixed state superconductor by means of current dissipation due to the onset of coherent vortex motion. Article in Lithuanian Nagrin jamas elektros srov s pasiskirstymas YBa2Cu3O7-x superlaidininko plonuose sluoksniuose, kuriuose lazerio spinduliu suformuoti ¦° formos s¨±kuri kanalai. Superlaid iajame darinyje atsiradus s¨±kuri kanalui, srov s tankis lokaliose darinio vietose gali skirtis 5 ir daugiau kart , priklausomai nuo kanalo geometrijos. Darbe eksperimenti kai nustatyta, kad Abrikosovo magnetini s¨±kuri koherentinis jud jimas s¨±kuri kanale siaurame temperat¨±r ruo e nuo 85,1 K iki 90,2 K prasideda superlaid iuoju dariniu tekant I ~ Ic ir i lieka iki ypa stipri srovi I > 200I1st step. ia I1st step ¨C srov s stipris, kuriam esant s¨±kuri kanale vyksta koherentinis s¨±kuri jud jimas, o Ic ¨C kritin superlaidininko srov . Koherentinis s¨±kuri jud jimas kanalo srityje eksperimentuose pasirei kia darini voltamperin se charakteristikose elektros tampos laipteliais¡°, kuri auk tis beveik nepriklauso nuo dariniu tekan ios srov s stiprio. Eksperimentiniai rezultatai paai kinti koherentinio s¨±kuri jud jimo ypatumais ¦° formos s¨±kuri kanalu. %K superconductors %K thin films %K critical current %K magnetic vortex %K superconducting channel %K pinning force %K Lorentz force %U http://www.mla.vgtu.lt/index.php/mla/article/view/372