Josephson Effect in Magnetic Superconductors with Spiral Magnetic Order
Kulic, Miodrag L. · Kulic, Igor M.
الأصل · EN
It is shown that in magnetic superconductors with spiral magnetic order the Josephson current has an additional contribution which depends: (i) on the relative orientation (magnetic phase) θ=θₗ-θᵣ of magnetizations on the left (L) and right (R) banks of the contact, (ii) on the junction helicity χ=χₗχᵣ, (with spiral helicity χₗ₍ᵣ₎=± 1), i.e. J=[Jc-Jχ θ] ϕ with ϕ=ϕₗ-ϕᵣ. The ratio Rχ≡ Jχ/Jc is calculated as a function of the superconducting order parameter Δ, the exchange field energy h and the wave vector Q of the spiral magnetic structure. The π-Josephson contact can be realized in such a system in some region of parameters. Some possible consequences of this new phase relation is also analyzed.
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