Abstract:
Unconventional superconductors with a multi-component order parameter support multiple phases of Abrikosov
vortex lattices. A unique feature of superconductors with a multi-component order parameter is that a doubly
quantized lattices may be stabilized at sufficiently high magnetic field. For two-dimensional irreducible
representations of the hexagonal point group appropriate to UPt3 we find a vortex lattice transition
between a an Abrikosov lattice of anisotropic, singly quantized vortices and a lattice of doubly quantized
vortices. The observation of an Abrikosov lattice of doubly quantized vortices provides a unique signature
of multi-component superconductivity. We also show that for doubly quantized vortices the current in the
vortex core circulated in the opposite direction to the vortex currents outside the core.
Contributed Paper for the Proceedings of the 19th International Conference on Low Temperature Physics, Brighton, UK.
Paper: [PDF]