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Microstretch model of type II superconductors

Radzikowska E.

Journal of Technical Physics

2003

Vol. 44, no 3

261-276

The Eringen theory of microstretch electromagnetic elastic solids is applied to describe the behaviour oftype-II superconductors interacting with a pinned dense vortex lattice. The electromagnetic, mechanical and thermal fields interactions in superconductors are considered. The electromagnetic interactions are described within the framework of the classical electrodynamics of microstretch elastic solids. The complete system of field equations is presented consisting of the balance laws, the constitutive relations and the jump conditions on the discontinuity surfaces. The linear magnetoelasticity equations of microstretch superconductors are presented.

Vortices and flux quantization in the gauge models of high temperature superconductors

Przeszowski J.

Journal of Technical Physics

2002

Vol. 43, no 2

219-222

In this brief note different kinds of vortex states in the gauge models of high temperature superconductivity are presented. These theoretical considerations are confronted with a possible future experimental verification.

Statistical physics of string-like objects in condensed matter. Dislocations and superconducting vortices

Rogula D.

Journal of Technical Physics

2002

Vol. 43, no 3

231-239

Material media containing dense distributions of linear, string-like objects are considered. Dislocation lines in structured solids and supercurrent vortices in type-II superconductors are exemplifications of such objects. The strings are assumed to carry a quantized Abelian topological charge, such as the Burgers vector or magnetic flux. The basic formulations of statistical physics of such systems are discussed. Contrary to the special cases of rectilinear strings, which reduce effectively to 2D systems of point-like particles, the statistical physics of 3D networks of flexible strings is treated on a stand alone basis from the first principles. The presented description takes into account the quenched, thermal, and quantum disorder in a unified way. Implications for the macroscopic setting are discussed.

Inhomogeneous superconductivity and vortices in the stripe states

Lenkowska-Czerwińska T.

Journal of Technical Physics

2002

Vol. 43, no 3

335-341

Spatially inhomogeneous features in the spin and charge structures have been indicated in the number of experiments on high temperature materials e.g. La2-xSrxCuO4. The simple realization of this state is striped domain wall where charges form a nanoscale linear pattern in an antiferromagnetically ordered isolator. These represent a nanoscale distribution of charge and spin that is believed to be commensurably locked by the tilt distortions of the lattice. The phenomenological model of charge and spin inhomogeneities in the stripe phase of superconducting cuprates on the ground of Ginzburg-Landau theory is proposed. The corresponding free energy for the coupled charge and spin-density wave, and superconducting order parameters is constructed. The phase diagram for inhomogeneous superconducting state is discussed. The effective coherence length and the penetration depth in the London limit are introduced. The critical magnetic fields and the energy of the isolated vortex line are obtained.