Issue |
Europhys. Lett.
Volume 44, Number 4, November II 1998
|
|
---|---|---|
Page(s) | 504 - 510 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1998-00502-1 | |
Published online | 01 September 2002 |
Non-trivial fixed-point structure of the two-dimensional
3-state Potts ferromagnet/spin glass
1
Laboratoire de Physique Quantique, IRSAMC, Université Paul Sabatier, F-31062, Toulouse, Cedex 4, France
2
Department of Physics, University of Waterloo - Waterloo, Ontario, N2L-3G1 Canada
3
Physics Department, Princeton University - Princeton, NJ 08544, USA
Received:
27
May
1998
Accepted:
24
September
1998
The fixed-point structure
of the 2D 3-state random-bond Potts model with a bimodal ()
distribution of couplings is
fully determined
using numerical renormalization group techniques.
Along the paramagnet-to-ferromagnet critical line we find a total
of four distinct fixed points:
i) the pure critical fixed point,
ii) the critical fixed point for the random-bond, but
unfrustrated, ferromagnet, iii) a bicritical
fixed point analogous to the bicritical Nishimori fixed point found in
the random-bond frustrated Ising model, and iv) the zero-temperature
spin-glass–to–ferromagnet critical fixed point.
Estimates of the associated critical exponents are
given for the various fixed points.
PACS: 75.10.Nr – Spin-glass and other random models / 05.70.Fh – Phase transitions: general aspects / 75.10.Hk – Classical spin models
© EDP Sciences, 1998
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