title: Flux line lattice reorientation in the borocarbide superconductors with H parallel a.
abstract: Small angle neutron scattering studies of the flux line lattice in LuNi2B2C and ErNi2B2C induced by a field parallel to the a axis reveal a first order flux line lattice reorientation transition. Below the transition the flux line lattice nearest neighbor direction is parallel to the b axis, and above the transition it is parallel to the c axis. This transition cannot be explained using nonlocal corrections to the London model. In addition, the anisotropy of the penetration depth lambda and the coherence length xi change at the transition.
authors.affiliation: Risø National Laboratory, Roskilde, Denmark.
authors.forename: M R
authors.initials: MR
authors.lastname: Eskildsen
authors.forename: A B
authors.initials: AB
authors.lastname: Abrahamsen
authors.forename: D
authors.initials: D
authors.lastname: López
authors.forename: P L
authors.initials: PL
authors.lastname: Gammel
authors.forename: D J
authors.initials: DJ
authors.lastname: Bishop
authors.forename: N H
authors.initials: NH
authors.lastname: Andersen
authors.forename: K
authors.initials: K
authors.lastname: Mortensen
authors.forename: P C
authors.initials: PC
authors.lastname: Canfield