IMPURITY-INDUCED MAGNETIC-ANOMALIES IN THE SLIGHTLY DILUTED LOW ANISOTROPY A(2)FE(1-X)IN(X)CL(5)CENTER-DOT-H2O, (A=K, RB) ANTIFERROMAGNETS - AN OVERVIEW

The phase diagram of low anisotropy antiferromagnets contains regions where small perturbations in the structure can induce rich interesting physical phenomenology that is still to be fully understood. This pap er reviews the anomalies observed in site-diluted antiferromagnets in two regions of the magnetic phase diagram: the region where the magnet ic field is very low, normally less than 10 Oe, and the spin-flop regi on. Although the observed phenomena is quite general, the magnetic beh avior of the solid solutions A(2)Fe(1-x)In(x)Cl(5). H2O, (A = K, Rb) i s used to exemplify such anomalies.