Inhomogeneous ground state and the coexistence of two length scales near phase transitions in real solids

Abstract

Real crystals almost unavoidably contain a finite density of dislocations. We show that this generic type of long--range correlated disorder leads to a breakdown of the conventional scenario of critical behavior and standard renormalization group techniques based on the existence of a simple, homogeneous ground state. This breakdown is due to the appearance of an inhomogeneous ground state that changes the character of the phase transition to that of a percolative phenomenon. This scenario leads to a natural explanation for the appearance of two length scales in recent high resolution small-angle scattering experiments near magnetic and structural phase transitions.

arXiv comment4 pages, RevTex, no figures; also available from http://www.tp3.ruhr-uni-bochum.de/archive/tpiii_archive.html

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