Abstract
We present local Hall probe and magneto-optical imaging measurements used to examine vortex pinning and dynamics in two of the magnetic borocarbide superconductors, ErNi2B2C (T c ≈ 10.8K) and HoNi2B2C (T c ≈ 8.9K), and compare with that obtained for non-magnetic YNi2B2C (T c ≈ 15.8K). The onset of significant pinning effects in ErNi2B2C and HoNi2B2C is coincident with the onset of an α-axis incommensurate ordering of the local moments below T a m ≈ 6K for ErNi2B2C and in a narrow temperature window between T AF m ≈ 5K < T < T a m ≈ 6K for HoNi2B2C. Elsewhere below T c , and for non-magnetic YNi2B2C, surface and geometrical barrier effects dominate flux penetration and hysteresis in the superconducting state. The data presented provides evidence that certain components of the magnetic order in (RE)Ni2B2C materials (α-axis incom.) interact with the vortex lattice and have a profound influence on vortex pinning and dynamics in the superconducting state.
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