Type-1.5 Superconductors

Details Type-1.5 Superconductors Type-1.5 Superconductors

2009-02-06

arxiv.org/abs/0902.0997v3

Physics

Condensed Matter

Superconductivity

accepted in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.117001

We demonstrate the existence of a novel superconducting state in high quality two-component MgB2 single crystalline superconductors where a unique combination of both type-1 (kappa_1 < 0.707) and type-2 (kappa_2 > 0.707) superconductor conditions is realized for the two components of the order parameter. This condition leads to a vortex-vortex interaction attractive at long distances and repulsive at short distances, which stabilizes unconventional stripe- and gossamer-like vortex patterns that we have visualized in this type-1.5 superconductor using Bitter decoration and also reproduced in numerical simulations.

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