Issue |
Europhys. Lett.
Volume 45, Number 2, January 1999
|
|
---|---|---|
Page(s) | 195 - 200 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00146-1 | |
Published online | 01 September 2002 |
Inhomogeneous ground state and the coexistence of two length scales near phase transitions in real solids
1
Electro-Engineering Institute - 197376 St. Petersburg, Russia
2
Theoretische Physik III, Ruhr-Universität - 44780 Bochum,
Germany
Received:
11
August
1995
Accepted:
22
November
1995
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.
PACS: 64.60.Ak – Renormalization-group, fractal, and percolation studies of phase transitions / 75.10.Nr – Spin-glass and other random models
© EDP Sciences, 1999
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