Bond-Percolation-like Picture for the Study of a Spin Glass

M. Hachi

Chinese Journal of Physics

43卷5期（2005 / 10 / 01）

942 - 954

英文

Using a theoretical model of spin glass systems (SG), similar to a bond percolation problem within a quantum statistical description, we examine the coalescence and the competition between the ferromagnetic and the antiferromagnetic aspects in these systems. This study shows that SG systems could appear as a general class containing both ferromagnetism and anti-ferromagnetism as two particular limits or bounds corresponding to y → 0 and y → 1, respectively, where y is the fraction of anti-ferromagnetic bonds. The specific heat is examined on the Nishomiri line and a nearly T^(−2)-temperature law is observed in agreement with the literature. A comparison between different kinds of averaging is also reported.