Quasi-long range order in glass states of impure liquid crystals, magnets, and superconductors

Abstract

In this review we consider glass states of several disordered systems: vortices in impure superconductors, amorphous magnets, and nematic liquid crystals in random porous media. All these systems can be described by the random-field or random-anisotropy O(N) model. Even arbitrarily weak disorder destroys long range order in the O(N) model. We demonstrate that at weak disorder and low temperatures quasi-long range order emerges. In quasi-long-range-ordered phases the correlation length is infinite and correlation functions obey power dependencies on the distance. In pure systems quasi-long range order is possible only in the lower critical dimension and only in the case of Abelian symmetry. In the presence of disorder this type of ordering turns out to be more common. It exists in a range of dimensions and is not prohibited by non-Abelian symmetries.

32 pages

References in corpus (3)

• Inverse melting of the vortex lattice
• Resonant peak splitting for ballistic conductance in magnetic superlattices
• Nonuniversal Correlations and Crossover Effects in the Bragg-Glass Phase of Impure Superconductors

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