Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1998-09-03
Phys. Rev. B 57 (1998) 7791
Physics
Condensed Matter
Disordered Systems and Neural Networks
3 figures
Scientific paper
10.1103/PhysRevB.57.7791
The temperature dependence of the uniform susceptibility, chi, of diluted two-dimensional Ising antiferromagnets Rb2Co1-xMgxF4,0<=x<=0.4, is investigated in the limit of vanishing external field. Novel data for x = 0.15 are compared with those obtained for x = 0 and 0.4 by Breed et al. (1969) and Ikeda (1983), respectively. Whereas in the pure case, x = 0, Fishers (1962) "energetic contribution" dominates, Aharony et al.s (1979,1986) "random contribution" becomes increasingly important with increasing x. Taking into account both terms not only with respect to the global ordering temperature, TN(x), but also in relation to the "local" phase transition temperatures TN throughout the Griffiths regime,TN(x)<=TN<=TN(0), a satisfactory quantitative description of chi vs. T is deduced for any x above the percolation threshold.
Belanger David P.
Binek Ch.
Kleemann W.
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