Question
The second Ginzburg–Landau equation is an expression for this quantity in terms of the Cooper pair wavefunction. For 10 points each:
[10m] Name this quantity, whose time derivative and curl are related to the electric and magnetic fields, respectively, in the London equations. This quantity equals sigma times the electric field by one form of Ohm’s law.
ANSWER: current density [reject partial answers]
[10e] This scientist’s namesake law states that the curl of the magnetic field is equal to the vacuum permeability times current density. This scientist also names the SI unit for current.
ANSWER: André-Marie Ampère
[10h] This parameter in Ginzburg–Landau theory is the characteristic exponent of variations of current density. The ratio of this quantity, symbolized xi (“ksye”), to a different quantity symbolized lambda defines a superconductor’s type.
ANSWER: superconducting coherence length
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