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

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

1998-05-28

arxiv.org/abs/cond-mat/9805377v1

Europhys. Lett. 45, 195 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

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

Scientific paper

10.1209/epl/i1999-00146-1

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.

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