Effect of fluctuations on vortex lattice structural transitions in superconductors

Abstract

The rhombic-to-square transition field $H_{\square }(T)$ for cubic and tetragonal materials in fields along [001] is evaluated using the nonlocal London theory with account of thermal vortex fluctuations. Unlike extended Ginzburg-Landau models, our approach shows that the line $H_{\square }(T)$ and the upper critical field $H_{c2}(T)$ do not cross due to strong fluctuations near $H_{c2}(T)$ which suppress the square anisotropy induced by the nonlocality. In increasing fields, this causes re-entrance of the rhombic structure in agreement with recent neutron scattering data on borocarbides.

4 pages, 2 figures

References in corpus (3)

• Temperature Dependence of the Flux Line Lattice Transition into Square Symmetry in Superconducting LuNi${}_2$B${}_2$C
• Field evolution of vortex lattice in LuNi_2B_2C seen by decoration in fields up to 1.5 kOe
• Elastic moduli of vortex lattices within nonlocal London model

Cited by in corpus (8)

• Reentrant vortex lattice transformation in four-fold symmetric superconductors
• Instability of square vortex lattice in d-wave superconductors is due to paramagnetic depairing
• Strain-induced inter-vortex interaction and vortex lattices in tetragonal superconductors
• Vortex Lattice Structural Transitions: a Ginzburg-Landau Model Approach
• Small-angle neutron scattering study of the vortex lattice in superconducting LuNi2B2C
• Anomalous Paramagnetic Effects in the Mixed State of LuNi2B2C
• First-Order Reorientation of the Flux-Line Lattice in CaAlSi
• Observation of a first-order phase transition deep within the vortex-solid region of YBa2Cu3O7