RANDOM-FIELD ISING-MODEL WITH 2ND-NEIGHBOR INTERACTION

Authors
BOBAK A TOTHOVA M BALCERZAK T
Citation
A. Bobak et al., RANDOM-FIELD ISING-MODEL WITH 2ND-NEIGHBOR INTERACTION, Journal of magnetism and magnetic materials, 128(1-2), 1993, pp. 29-34
Citations number
20
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
128
Issue
1-2
Year of publication
1993
Pages
29 - 34
Database
ISI
SICI code
0304-8853(1993)128:1-2<29:RIW2I>2.0.ZU;2-8
Abstract
A random-field Ising model with second-neighbour interaction has been investigated using the new effective-field theory. The phase diagrams are examined in detail for the square lattice in a random field obeyin g the bimodal symmetric distribution. A tricritical point is found in the system, in contrast to the corresponding nearest-neighbour interac tion Ising model. In particular, the tricritical phase diagram for a b ody-centered cubic lattice in nearest-neighbour approximation is also determined.