Observation of a field-driven structural phase transition in the flux line lattice in ErNi2B2C

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1997-03-10
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Eskildsen, MR
Gammel, PL
Barber, BP
Yaron, U
Ramirez, AP
Huse, DA
Bishop, DJ
Bolle, C
Lieber, CM
Oxx, S
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American Physical Society
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Canfield, Paul
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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 [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.
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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.
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