Voltage jumps in current-voltage characteristics ofBi2Sr2CaCu2O8+δsuperconducting films: Evidence for flux-flow instability under the influence of self-heating

1998 ◽  
Vol 57 (2) ◽  
pp. R736-R739 ◽  
Author(s):  
Z. L. Xiao ◽  
P. Voss-de Haan ◽  
G. Jakob ◽  
H. Adrian
Keyword(s):  
Flow Instability ◽  
Flux Flow ◽  
Self Heating ◽  
Current Voltage ◽  
Current Voltage Characteristics

Instability of the Vortex-Antivortex System in Anisotropic Hard Superconductors with Nonlinear Current-Voltage Characteristics

2003 ◽  
Vol 17 (10n12) ◽  
pp. 589-595
Author(s):  
L. M. Fisher ◽  
A. L. Rakhmanov ◽  
A. A. Levchenko ◽  
V. A. Yampol'Skii ◽  
M. Bazilevich ◽  
...  
Keyword(s):  
Dispersion Equation ◽  
Vortex Motion ◽  
Wave Number ◽  
Flux Flow ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
The Stability ◽  
Small Anisotropy

The stability of the anisotropic flux flow in the vortex-antivortex system of a superconductor is theoretically studied. The vortex motion is assumed to be governed by the power current-voltage (I-V) characteristic, E ∝ Jm. It is shown that the instability of the interface between vortices and antivortices occurs even at relatively small anisotropy of the current capability of a sample if the exponent m is large. The dispersion equation defining the dependence of the increment of the instability on the wave number is obtained and analyzed. The instability leads to the macroturbulence of the flux flow which is observed in superconductors of the system Y-123.

EFFECTS OF PINNING ANISOTROPY ON YBCO FILM CURRENT-VOLTAGE CHARACTERISTICS

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2803-2808
Author(s):  
C. CAMERLINGO ◽  
C. NAPPI ◽  
M. RUSSO
Keyword(s):  
Unit Length ◽  
Vortex Motion ◽  
Temperature Limit ◽  
Flux Flow ◽  
Plane Anisotropy ◽  
Current Voltage ◽  
Pinning Potential ◽  
Oriented Films ◽  
Different Temperatures ◽  
Current Voltage Characteristics

The dissipative properties of (103)/(031) oriented films YBCO films grown on (110) SrTiO3 substrates were investigated in the vortex creep motion regime and compared with characteristics of c-axis oriented films deposited on both and (001)SrTiO3 and (001)NdGaO3 substrates. The current-voltage characteristics were measured at different temperatures, using a proper geometrical bridge configuration, able to test space anisotropy. The in-plane anisotropy due to the layered structure of the superconductor was clearly observed in the (103)/(031) oriented films. Experimental data are consistent with a thermal activated mechanism of vortex motion on a periodic pinning potential, attributed to intrinsic layer pinning. The intrinsic pinning energy per unit length of magnetic field line is evaluated as U0≈400 KeV/cm, in the low temperature limit. Consistently with theory, this energy is weakly dependent on temperature, the U/KBT ratio fading out at T ≈ Tc, where flux flow mechanism is activated for vortex motion.

Effect of self-heating on flux flow instability in a superconductor near Tc

1992 ◽  
Vol 202 (3-4) ◽  
pp. 234-242 ◽  
Author(s):  
A.I. Bezuglyj ◽  
V.A. Shklovskij
Keyword(s):  
Flow Instability ◽  
Flux Flow ◽  
Self Heating

NBCO MICRO BRIDGE JUNCTIONS FABRICATED BY EXCIMER LASER PATTERNING

2002 ◽  
Vol 16 (09) ◽  
pp. 1301-1306
Author(s):  
ZON MORI ◽  
ZULHAIRI BIN ZULKIFLI ◽  
TOSHIYA DOI ◽  
SHINICHIRO KOBA ◽  
YOSHINORI HAKURAKU
Keyword(s):  
Thin Films ◽  
Excimer Laser ◽  
Zero Bias ◽  
Flux Flow ◽  
Laser Patterning ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Krf Excimer Laser ◽  
Superconducting Current

Micro bridge junctions of NdBa 2 Cu 3 O 7-δ (NBCO) thin films have been fabricated by using a pulsed KrF excimer laser. A 1 μm bridge with nonliner flux-flow like current-voltage characteristics was obtained by optimizing the laser patterning process. The superconducting current (Ic0) across the micro bridge at zero bias was 900 nA and suppressed by the radiation of microwave (10 GHz) at 77 K.

scholarly journals Theory of the current-voltage characteristics of SNS junctions and other superconducting weak links

1970 ◽  
Vol 268 (1188) ◽  
pp. 265-287 ◽  
Keyword(s):  
Phase Locking ◽  
Current Source ◽  
Voltage Source ◽  
Weak Links ◽  
Detailed Calculation ◽  
Flux Flow ◽  
Step Structure ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Density Equation

A theory of the current-voltage characteristics of superconducting-normal-superconducting junctions is proposed. The theory is based on a simple model current-density equation. The form of the currentvoltage characteristic is found to depend critically on whether the electrical source should be treated as a current source or a voltage source at high frequencies. A picture is given of the dynamical state of a junction at finite voltage, and all the important differences between the characteristics observed for SNS junctions and tunnel junctions are explained at least qualitatively. In particular, the theory covers the cases of a junction wide enough to be limited by its own field and the step structure known to be induced by an applied h.f. field. For wide junctions the predicted behaviour is an exactly calculable quantized flux flow in one dimension. It is the phase-locking of this flux flow by the applied h.f. field which leads to the step structure. A detailed calculation of the rounding of the steps by noise is given; the steps are predicted to be exceedingly steep. The theory is compared with the theories of other superconducting weak links.

Sign in / Sign up

Export Citation Format

Share Document