Abstract
Magnetic neutron scattering has played an important role both in uncovering new phenomena in UPt 3 as well as accounting for many of the unusual properties found in other experiments. UPt 3 has the double hexagonal close packed structure (space group P6 3 /mmc) with two uranium atoms per unit cell. Magnetic spectroscopy at energies close to the pairing energy of a superconductor is interesting because it reveals both processes that may compete with superconductivity and the size and nature of the superconducting gap function. Neutron scattering is an excellent probe of flux lattices in superconductors because the dipole moment of the neutron couples to the magnetic field inhomogeneities associated with such lattices. Of course, the length scales for the inhomogeneities are simply λ and ξ, the bulk magnetic penetration depth and pair coherence length, respectively, for the superconductor. Thus, beyond allowing determinations of the vortex lattice structure, neutron diffraction yields values for λ and ξ.
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