Giant vortices, vortex rings and reentrant behavior in type-1.5 superconductors

Vu Hung Dao (1, 2) , L. F. Chibotaru (1) , T. Nishio (1, 3) , V. V. Moshchalkov (1)

1 INPAC - Institute for Nanoscale Physics and Chemistry
2 LOMA - Laboratoire Ondes et Matière d'Aquitaine
3 Department of Physics

We predict that in a bulk type-1.5 superconductor the competing magnetic responses of the two components of the order parameter can result in a vortex interaction that generates group-stabilized giant vortices and unusual vortex rings in the absence of any extrinsic pinning or confinement mechanism. We also find within the Ginzburg-Landau theory a rich phase diagram with successions of behaviors like type-1 -> type-1.5 -> type-2 -> type-1.5 as temperature decreases.

Domaines: Supraconductivité [cond-mat.supr-con]; Gaz Quantiques [cond-mat.quant-gas]

Vu Hung Dao, L. F. Chibotaru, T. Nishio, V. V. Moshchalkov. Giant vortices, vortex rings and reentrant behavior in type-1.5 superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83 (2), pp.020503 (4). ⟨10.1103/PhysRevB.83.020503⟩. ⟨hal-00608348⟩