Vortex matter

Neutron scattering from the flux line lattice in PrOs4Sb12at 100 mK in a magnetic field of 0.2 Tesla.

The low dimensionality and high critical temperature of the cuprate superconductors lead to a rich structure in the vortex phase diagram. The (H,T) diagram shows an extended region of a liquid-like structure with a first order transition into the flux-line lattice state. In the fully isotropic and cubic superconductor KxBa1-xBiO3, transport data show similar features which suggest the existence of a vortex liquid state over a large portion of the phase diagram in this system, too.
The flux line lattice structure of a superconductor can be investigated by means of small angle neutron scattering. For instance, the departure of the flux line lattice in UPt3 from the hexagonal symmetry can be used for an experimental determination of the symmetry of the superconducting order parameter.
Among other investigated systems: The skutterudite PrOs4Sb12 and the two band superconductor MgB2.


Last update : 10/11 2013 (289)


Retour en haut