Observation of a field-driven structural phase transition in the flux line lattice in ErNi2B2C
American Physical Society
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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.
This article is published as Eskildsen, M. R., P. L. Gammel, B. P. Barber, U. Yaron, A. P. Ramirez, D. A. Huse, D. J. Bishop et al. "Observation of a field-driven structural phase transition in the flux line lattice in ErNi 2 B 2 C." Physical Review Letters 78, no. 10 (1997): 1968. DOI: 10.1103/PhysRevLett.78.1968. Copyright 1997 American Physical Society. Posted with permission.