| Issue |
Europhys. Lett.
Volume 44, Number 4, November II 1998
|
|
|---|---|---|
| Page(s) | 478 - 483 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00497-y | |
| Published online | 01 September 2002 | |
Effect of weak disorder in the fully frustrated XY model
INFM Unità di Napoli, Dipartimento di Scienze Fisiche, Mostra D'Oltremare Pad. 19, 80125 Napoli, Italy
Received:
18
May
1998
Accepted:
29
September
1998
The critical behaviour of the fully frustrated XY model in the presence of weak
positional disorder is studied in a square lattice by Monte Carlo methods.
The critical exponent associated to the divergence of the chiral correlation
length is found to be 
already at very small values of
disorder. Furthermore the helicity modulus jump is found larger than the
universal value expected in the XY model.
PACS: 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems / 75.10.Hk – Classical spin models / 75.40.Mg – Numerical simulation studies
© EDP Sciences, 1998
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