HIGH-TEMPERATURE SERIES ANALYSIS OF 2D RANDOM-BOND ISING-FERROMAGNETS

We analyze new high-temperature series expansions for the susceptibili ty chi of the two-dimensional random-bond Ising ferromagnet with a sym metric bimodal distribution of two positive couplings J(1) and J(2). B y studying a wide range of coupling ratios J(2)/J(1) we obtain compell ing evidence for a critical behavior of the form chi similar to t(-7/4 )\1n t\(7/8), as predicted theoretically by Shalaev, Shankar, and Ludw ig.