Instability of the Vortex Matter in YBCO Single Crystals
- Conference date: 10-17 August 2005
- Location: Orlando, Florida (USA)
A theory of the macroturbulent instability in the system containing vortices of opposite directions (vortices and antivortices) in hard superconductors is proposed. The origin of the instablity is connected with the anisotropy of the current capability in the sample plane. The anisotropy results in the appearance of tangential discontinuity of the hydrodynamic velocity of vortex and antivortex motion near the front of magnetization reversal. The examination is performed on the basis of the anisotropic power‐law current‐voltage characteristics. The instability is shown to be observed even at relatively weak anisotropy. The physical nature of the macroturbulent instability in the vortex matter in YBCO superconductors is verified by means of magnetooptic study of the instability in a single crystal prepared specially for this purpose. The instability develops near those sample edges where the oppositely directed flow of vortices and antivortices, guided by twin boundaries, is characterized by the discontinuity of the tangential component of the hydrodynamic velocity.
- Rotating flows
- Flow instabilities
- Magnetic anisotropy
- High temperature superconductivity
- Single crystals
- Magnetization reversals
- Superconductivity models
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