Small-angle neutron scattering and magnetic decoration both demonstrate a topological transition in the flux line lattice (FLL) in ErNi2B2C. The high-field square lattice slowly transforms into a hexagonal lattice via an area preserving  rhombohedral distortion below roughly 500 Oe. The square FLL is aligned with the  direction of the tetragonal crystal, while the two domains of the hexagonal FLL are aligned with  and . The differences in pinning for the two FLL topologies are reflected in the rf kinetic inductance.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)