We study a current-biased 0-π-0 Josephson junction made by high-Tc superconductors, theoretically. When a length of the π junction is large enough, this junction contains a vortex-antivortex pair of both ends of the π junction. Magnetic flux carried by the vortices is calculated using the sine-Gordon equation. The result shows that the magnetic flux of the vortices is suppresed to zero as the distance between the vortices is reduced. By applying an external current, the orientation of the vortices is reversed, and a voltage pulse is generated. The current needed for this transition and generated pulse energy are calculated. Macroscopic quantum tunneling (MQT) in this transition is also studied. The tunneling rate has been evaluated by an effective Hamiltonian with one degree of freedom.
- Half vortex
- High-T superconductor
- Macroscopic quantum tunneling
- Sine-Gordon equation
- π junction
ASJC Scopus subject areas
- General Physics and Astronomy