Half-integer Shapiro steps in highly transmissive InSb nanoflag Josephson junctions

Shapiro steps in Josephson Junctions

We use Ginzburg-Landau theory to describe the phase transition to the superconducting state and the current through a superconductor. Applying quantum mechanics to the Josephson junction following Feynmann’s method the Josephson relations for AC and DC current through the junctions is obtained. The resistively shunted Josephson junction and the resistively and capacitively shunted Josephson jun...

Shapiro Steps in BSCCO Intrinsic Josephson Junctions

Subharmonic Shapiro steps in high-Tc Josephson junctions

We studied the response of high-Tc biepitaxial grain boundary junctions to 100 GHz radiation in the presence of a magnetic field. Integer as well as subharmonic constant voltage steps are observed, even at one-fifth of the voltage separation between integer ~Shapiro! steps. Our results indicate that this behavior is due to the synchronized motion of Josephson vortices along the junction. We sho...

Half-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction.

We investigate the current-phase relation of S/F/S junctions near the crossover between the 0 and the pi ground states. We use Nb/CuNi/Nb junctions where this crossover is driven both by thickness and temperature. For a certain thickness a nonzero minimum of critical current is observed at the crossover temperature. We analyze this residual supercurrent by applying a high frequency excitation a...

Half-Integer Shapiro Steps at the 0- Crossover of a Ferromagnetic Josephson Junction

257005-1 We investigate the current-phase relation of S=F=S junctions near the crossover between the 0 and the ground states. We use Nb=CuNi=Nb junctions where this crossover is driven both by thickness and temperature. For a certain thickness a nonzero minimum of critical current is observed at the crossover temperature. We analyze this residual supercurrent by applying a high frequency excita...