Title :
Re-entrant ferromagnetism in 2D and 3D Ising model with random nearest-neighbour interactions
Author :
Toth, Lubomir ; Tothova, M.
Author_Institution :
Dept. of Theor. Phys. & Geophys., Safarik (P.J.) Univ., Kosice, Czechoslovakia
fDate :
3/1/1994 12:00:00 AM
Abstract :
We present the study of phase diagrams in spin-1/2 Ising model for honeycomb, square, triangular and simple-cubic lattices using the two-spin cluster approximation. We consider nearest-neighbour ferromagnetic exchange interactions J with concentration p and exchange interactions αJ (|α|<1) with concentration (1-p). The phase diagrams in α-tc-1 plane show re-entrant behavior in certain ranges of concentration p
Keywords :
Ising model; cluster approximation; exchange interactions (electron); ferromagnetic properties of substances; ferromagnetism; magnetic impurity interactions; magnetic transitions; Ising model; honeycomb; nearest-neighbour ferromagnetic exchange interactions; phase diagrams; random nearest-neighbour interactions; re-entrant ferromagnetism; simple-cubic lattices; square; triangular; two-spin cluster approximation; Antiferromagnetic materials; Approximation methods; Elementary particle exchange interactions; Equations; Geophysics; Impurities; Lattices; Physics; Random variables; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
