scholarly journals First-order phase transition in a 2D random-field Ising model with conflicting dynamics

2009 ◽  
Vol 2009 (02) ◽  
pp. P02058 ◽  
Author(s):  
Nuno Crokidakis
2020 ◽  
Vol 101 (5) ◽  
Author(s):  
Firas Hamze ◽  
Jack Raymond ◽  
Christopher A. Pattison ◽  
Katja Biswas ◽  
Helmut G. Katzgraber

1998 ◽  
Vol 12 (25n26) ◽  
pp. 1089-1095 ◽  
Author(s):  
H. Yurtseven ◽  
A. Yanik ◽  
W. F. Sherman

We calculate in this work the specific heat CVI using the predictions of an Ising model for the NH 4 Br crystal (T C =234 K, P=0). Our calculated CVI values are in good agreement with the experimentally observed CP data from the literature. This shows that the observed behavior of NH 4 Br can be described adequately in the lattice region under an Ising model studied here.


1992 ◽  
Vol 06 (08) ◽  
pp. 1181-1192 ◽  
Author(s):  
J.M. WESSELINOWA ◽  
M.S. MARINOV

Based on the Hamiltonian of the Ising model in a transverse field, we have considered the four-spin interaction which is responsible for the first-order phase transition observed in order-disorder ferroelectrics. Using the method of the retarded Green’s function we have determined the relative polarization, the spin-wave energy, the transverse and longitudinal damping. They are numerically calculated and discussed for different temperature and tunneling frequency values in the cases of first- and second-order phase transitions.


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