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Flux line lattice symmetries in the borocarbide superconductor LuNi2B2C |
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| Authors: | MR Eskildsen AB Abrahamsen PL Gammel DJ Bishop NH Andersen K Mortensen PC Canfield |
| Institution: | 1. DPMC, University of Geneva, 24 Quai E.-Ansermet, CH-1211, Genève, Switzerland 2. Ris? National Laboratory, P.O.Box 49, DK-4000, Roskilde, Denmark 3. Agere Systems, 700 Mountain Avenue, 07974, New Jersey, USA 4. Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, 07974, New Jersey, USA 5. Ames Laboratory and Iowa State University, 50011, Iowa, USA |
| Abstract: | We compare the results of small angle neutron scattering on the flux line lattice (FLL) obtained in the borocarbide superconductor LuNi2B2C with the applied field along the c- and a-axes. For H‖c the temperature dependence of the FLL structural phase transition from square to hexagonal symmetry was investigated. Above 10 K the transition onset field. H 2(T), rises sharply, bending away from H c2(T) in contradiction to theoretical predictions of the two merging. For H‖a a first order FLL reorientation transition is observed at H tr=3–3.5 kOe. Below H tr the FLL nearest neighbor direction is parallel to the b-axis, and above H tr to the c-axis. This transition cannot be explained using nonlocal corrections to the London model. |
| Keywords: | Borocarbide flux line lattice symmetry |
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