Magnetization process in layered superconductors under a magnetic field parallel to the layers

Superconducting Properties of Layered Cuprate Oxides

“…This decrease is caused by the field inversion, as shown in Ref. 6). This field inversion explains the first order transition at Hc1 seen in the magnetization curve in layered superconductors with inequivalent layers.…”

“…5 > The anomalous interaction between the flux lines parallel to the layers is reflected by an unusual magnetization process in the mixed state. 6 …”

Magnetic-field inversion in vortices in multilayers

“…A field inversion has already been presented in [3]. However it was derived using a discretized model.…”

“…The case where the external field is parallel to the layers is an especially interesting one. It was shown numerically [3], for example, that in layered superconductors with inequivalent layers immersed in a magnetic field parallel to the layers, the field around a vortex can be inverted. The inversion can be achieved only when the in-plane penetration depth of the weakly superconducting layers is much greater than that of the strongly superconducting layers.…”

“…In our work the variation of Ψ arises naturally from α(z), which creates the undulating structure. Furthermore, the result of [3] was derived near H c1 , and it does not assume that d > λ. Thus the inversion in [3] occurs mostly along the y-axis, unlike our inversion.…”