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

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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
Canfield, Paul
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Physics and Astronomy
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

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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.
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.