6.4 Electromagnetic Phenomena Caused by Rotation of Flux Lines
141
Fig. 6.20 a Electric potential observed at three positions along the specimen length on the surface
of a cylindrical Pb-Tl superconductor [5] and b the corresponding theoretical prediction based on
helical flux flow [19]
Fig. 6.21 Electric field
component due to B × v in a
region where flux lines go
out of the superconductor
×
i.e., the radial electric field, occurs along the direction from ϕ = π/2 to ϕ = 3π/2.
This electric field is caused by the translational motion of the longitudinal flux component along the direction from ϕ = 0 to ϕ = π . This is consistent with the appearance
of the longitudinal negative electric field at around ϕ = π . Such a radial electric field
was really observed [21], and this observation gives a proof of the helical flux flow.
141
Fig. 6.20 a Electric potential observed at three positions along the specimen length on the surface
of a cylindrical Pb-Tl superconductor [5] and b the corresponding theoretical prediction based on
helical flux flow [19]
Fig. 6.21 Electric field
component due to B × v in a
region where flux lines go
out of the superconductor
×
i.e., the radial electric field, occurs along the direction from ϕ = π/2 to ϕ = 3π/2.
This electric field is caused by the translational motion of the longitudinal flux component along the direction from ϕ = 0 to ϕ = π . This is consistent with the appearance
of the longitudinal negative electric field at around ϕ = π . Such a radial electric field
was really observed [21], and this observation gives a proof of the helical flux flow.