This problem is due to crystal grain boundaries in the material: when the grain boundary angle is greater than about 5 degrees the supercurrent cannot cross the boundary.
When the grain boundary angle is greater than about 5 degrees, the supercurrent cannot cross the boundary. This problem is due to crystal grain boundaries in the material.
This problem is due to crystal grain boundaries in the material. When the grain boundary angle is greater than about 5 degrees, the supercurrent cannot cross the boundary.
This problem is due to crystal grain boundaries in the material. When the grain boundary angle is greater than about 5 degrees, the supercurrent cannot cross the boundary.