Journal
PHYSICAL REVIEW B
Volume 67, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.67.094110
Keywords
-
Ask authors/readers for more resources
Heat bath Monte Carlo simulations have been used to study a four-state clock model with a type of random field on simple cubic lattices. The model has the standard nonrandom two-spin exchange term with coupling energy J and a random field that consists of adding an energy D to one of the four-spin states, chosen randomly at each site. This Ashkin-Teller-like model does not separate; the two random-field Ising model components are coupled. When D/J=3, the ground states of the model remain fully aligned. When D/Jgreater than or equal to4, a different type of ground state is found, in which the occupation of two of the four-spin states is close to 50%, and the other two are nearly absent. This means that one of the Ising components is almost completely ordered, while the other one has only short-range correlations. A large peak in the structure factor S(k) appears at small k for temperatures well above the transition to long-range order, and the appearance of this peak is associated with slow, glassy dynamics. The phase transition into the state where one Ising component is long-range ordered appears to be first order, but the latent heat is very small.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available