What is correct expression for super current density?
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J=-en
J=-ev
J=-env
J=env
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Answer:
Electrodynamics of Superconductors: Weakly Coupled
M. Kupriyanov, in Encyclopedia of Materials: Science and Technology, 2001
1.1 Supercurrent
In accordance with Eqn. (1) a d.c. supercurrent in the range
(4)
can flow across the junction as a result of a constant phase difference φ. An external system supporting this phase difference represents work on the supercurrent and, thus, stores potential energy in the junction given by
(5)
Since the energy is conserved in the form of persistent current, the Josephson junction can be considered as having a nonlinear inductance
(6)
This means that for weak signals the supercurrent is equivalent to an inductance LS dependent on φ(t) and on the critical current of the junction.
The most impressive property of a supercurrent is its ability to oscillate (Josephson oscillations) with a frequency
(7)
if a nonzero d.c. voltage, , is fixed across the junction. At typical voltages (10−6–10−2 V) the oscillation frequency, fS, is of the order of 109–1013 Hz.
Explanation:
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