Two-order-parameter GL fits
نویسندگان
چکیده
(cf. Eqn. (3), (4) of Ref. [1]). Phenomenologically, the coupling term can be motivated in the weak coupling limit by the requirement that it should yield a cos(φ1 − φ2) dependence on the phase difference and not change the free energy if two identical superconductors with the same phase are coupled to each other. For small γ and near Tc, it also reproduces the temperature dependence of the critical current density Jc = γ2π/Φ0|ψ1||ψ2| near Tc, which was calculated from microscopic theory in Refs. [2, 3]. For identical Tc,1 = Tc,2, one obtains Jc ∝ |ψ| ∝ 1 − T/Tc. For T / Tc,1 < Tc,2 on the other hand, the temperature dependence near Tc,1 is dominated by |ψ1| ∝ √ 1− T/Tc. By absorbing the terms γ|ψi| in the functional (1) into the quadratic terms in Fi and renormalizing the order parameter, it can be brought into the form
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تاریخ انتشار 2006