Vortex liquid crystals in anisotropic type II superconductors.

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Comment on vortex liquid crystal in anisotropic type II superconductors.

Comment on " Vortex Liquid Crystal in Anisotropic Type II Superconductors " Recently Carlson et al. [1] tried to compose the H − T phase diagram of anisotropic superconductors based on the Lindemann criterion for melting of flux-line lattice. It is worthy to notice that the issue itself is interesting. However, their conclusion on the existence of a smectic vortex phase is unphysical for the fo...

Comment on ”Vortex Liquid Crystal in Anisotropic Type II Superconductors” The suppression of superconductivity in type II superconductors

Comment on " Vortex Liquid Crystal in Anisotropic Type II Superconductors " The suppression of superconductivity in type II superconductors is associated with the melting transition of the lattice of flux quanta [1, 2, 3]. Most melting phenomena in Nature are thermodynamic first-order phase transitions. An analytic description of melting is thus difficult since there is no good handle, such as ...

Lyotropic mesophases as defects in binary mixtures

2014 The classification of defects in ordered media is applied to the case of binary mixtures. Stable defects must be surfaces, and, in that case, interfaces. For lyotropic systems, a negative surface energy leads to a maximization of the interface area. One thus obtains, with increasing surfactant concentration, micelles, and then liquid crystal phases which must be considered as ordered defec...

Phase transitions in high-Tc superconductors and the anisotropic three-dimensional XY model

We carry out simulations of the anisotropic uniformly frustrated three-dimensional XY model, as a model for vortex line fluctuations in high-Tc superconductors. We compute the phase diagram as a function of temperature and anisotropy, for a fixed applied magnetic field B . We find that superconducting coherence parallel to B persists into the vortex line liquid state, vanishing at a Tcz above t...