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Magnetic properties of superconductors

Magnetic properties of superconductors. Section 53. Compare to electro static force on conductors!. A superconductor has no macroscopic volume currents inside. Surface current is determined by H-field outside a superconductor. Contrast to normal conductor or magnetized body.

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Magnetic properties of superconductors

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  1. Magnetic properties of superconductors Section 53

  2. Compare to electrostatic force on conductors!

  3. A superconductor has no macroscopic volume currents inside

  4. Surface current is determined by H-field outside a superconductor

  5. Contrast to normal conductor or magnetized body For a normal conductor This equation restricts possible value of current based on Bin. Surfacecurrent is determined by B-field inside a normal conductor

  6. For current through any cross section of a normal conductor, the surface currents always balance out to zero. For superconductor, we can have non-zero total current on the surface. Even though H has no physical meaning inside, it need not be zero. Continuity of Ht still holds. In super state B -> 0 implies m = B/H -> 0 simultaneously. Then is indeterminate. Does not restrict values of current. Total current through any cross section need not be zero.

  7. Magnetized normal body also has a surface current, but it is restricted so that the net current through any cross section is zero.

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