Title :
Shapiro step responses in the flux-flow state of bi-2212 intrinsic Josephson junctions with cooperation of pancake vortices
Author :
Yamada, Y. ; Nakajima, Kensuke ; Yasuda, Toshiyuki ; Yamashita, Takayoshi ; Nakajima, Kensuke
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
6/1/2005 12:00:00 AM
Abstract :
Flux-flow properties of one-dimensionally long Bi-2212 intrinsic Josephson junction stacks are studied. Quasioptically irradiated millimeter waves drives Josephson vortices and reveals current steps in equal voltage intervals corresponding to the Josephson relation. Differential conductance properties and the power dependence of the current step height are also measured. The experimental results indicate that the responses are consistent with the Shapiro step. Periodic potentials produced by pancake vortices are considered to be effective to realize the in-phase collective motion of the Josephson vortices.
Keywords :
Josephson effect; bismuth compounds; calcium compounds; flux flow; high-temperature superconductors; strontium compounds; superconducting junction devices; Bi-2212; Bi2Sr2CaCu2O8; High-temperature superconductors; Josephson effects; Josephson vortices; Shapiro step responses; flux-flow properties; flux-flow state; intrinsic Josephson junctions; pancake vortices; Electromagnetic scattering; Frequency; Josephson effect; Josephson junctions; Magnetic fields; Millimeter wave communication; Millimeter wave measurements; Millimeter wave technology; Oscillators; Superconductivity; High-; Josephson effects; Shapiro step; intrinsic Josephson junctions;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.850189