Reentrant vortex lattice transformation in four-fold symmetric superconductors

Abstract

The physics behind the rhombic$\to$square$\to$rhombic flux line lattice transformation in increasing fields is clarified on the basis of Eilenberger theory. We demonstrate that this reentrance observed in LuNi${}_2$B${}_2$C is due to intrinsic competition between superconducting gap and Fermi surface anisotropies. The calculations reproduce not only it but also predict yet not found lock-in transition to a square lattice with different orientation in higher field. In view of physical origin given, this sequence of transitions is rather generic to occur in four-fold symmetric superconductors.

5 pages, 4 figures,submitted to Phys. Rev. Lett

References in corpus (9)

• Gap Function with Point Nodes in Borocarbide Superconductor YNi_2B_2C
• Direct evidence for an intrinsic square vortex lattice in the overdoped high-Tc superconductor La1.83Sr0.17CuO4+d
• Ansiotropic s- wave superconductivity in borocarbides LuNi2B2C and YNi2B2C
• Highly Anisotropic Gap Function in Borocarbide Superconductor LuNi_2B_2C
• Low Energy Quasiparticle Excitation in the Vortex State of Borocarbide Superconductor YNi_2B_2C
• Temperature Dependence of the Flux Line Lattice Transition into Square Symmetry in Superconducting LuNi${}_2$B${}_2$C
• Effect of fluctuations on vortex lattice structural transitions in superconductors
• Nonlocal Effects and Shrinkage of the Vortex Core Radius in YNi2B2C Probed by muSR
• Field evolution of vortex lattice in LuNi_2B_2C seen by decoration in fields up to 1.5 kOe

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