Temperature Dependence of the Flux Line Lattice Transition into Square Symmetry in Superconducting LuNi${}_2$B${}_2$C

Abstract

We have investigated the temperature dependence of the H || c flux line lattice structural phase transition from square to hexagonal symmetry, in the tetragonal superconductor LuNi_2B_2C (T_c = 16.6 K). At temperatures below 10 K the transition onset field, H_2(T), is only weakly temperature dependent. Above 10 K, H_2(T) rises sharply, bending away from the upper critical field. This contradicts theoretical predictions of H_2(T) merging with the upper critical field, and suggests that just below the H_c2(T)-curve the flux line lattice might be hexagonal.

arXiv comment4 pages, 3 figures

References in corpus (2)

• Field dependence of the vortex structure in d-wave and s-wave superconductors
• Generalized London free energy for high-$T_c$ vortex lattices

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