Abstract
Small-angle neutron scattering and magnetic decoration both demonstrate a topological transition in the flux line lattice (FLL) in ${\mathrm{ErNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$. The high-field square lattice slowly transforms into a hexagonal lattice via an area preserving [100] rhombohedral distortion below roughly 500 Oe. The square FLL is aligned with the [110] direction of the tetragonal crystal, while the two domains of the hexagonal FLL are aligned with [100] and [010]. The differences in pinning for the two FLL topologies are reflected in the rf kinetic inductance.
Highlights
Small-angle neutron scattering and magnetic decoration both demonstrate a topological transition in the flux line lattice (FLL) in ErNi2B2C
The square FLL is aligned with the [110] direction of the tetragonal crystal, while the two domains of the hexagonal FLL are aligned with [100] and [010]
Small-angle neutron scattering (SANS) studies [2] of the FLL in the magnetic superconductor ErNi2B2C found a square FLL at high fields, contradictious to the hexagonal FLL typically found in strongly typeII superconductors
Summary
Observation of a field-driven structural phase transition in the flux line lattice in ErNi 2 B 2 C Observation of a Field-Driven Structural Phase Transition in the Flux Line Lattice in ErNi2B2C
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