CONTINUOUS- AND FIRST-ORDER PHASE TRANSITIONS IN ISING ANTIFERROMAGNETS WITH NEXT-NEAREST- NEIGHBOUR INTERACTIONS

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CONTINUOUS- AND FIRST-ORDER PHASE TRANSITIONS IN ISING ANTIFERROMAGNETS WITH NEXT-NEAREST- NEIGHBOUR INTERACTIONS

Post by Algerien1970 on Mon 15 Jun - 18:14

CONTINUOUS-  AND  FIRST-ORDER  PHASE  TRANSITIONS IN  ISING  ANTIFERROMAGNETS  WITH 
 NEXT-NEAREST-NEIGHBOUR  INTERACTIONS




A. Malakis, P. Kalozoumis and N. G. Fytas


Section of Solid State Physics, Department of Physics, University of Athens, Panepistimiopolis, GR 15784
Zografos, Athens, Greece
Received: December 08, 2006


Abstract. Both the square and triangular Ising antiferromagnetic systems with next-nearest neighbour interactions are studied by a new efficient entropic scheme. Using the energy distribution and order parameter’s fourth order cumulant it is illustrated that the two models behave quite differently. For the square model we establish strong numerical evidence showing a continuous transition scaling, whereas for the triangular model a first-order transition is verified. Our results are compared with the existing predictions and controversies in the literature.

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