MAGNETIC-PROPERTIES OF LA2CU1-XZNXO4+DELTA

A study of the magnetic properties of La2Cu1-xZnxO4+delta (0 less than or equal to x less than or equal to 0.13; delta=0.02) by means of mag netization measurements (M vs. T, H) is reported. The Neel temperature of the 3D antiferromagnetic order (AF) is found to decrease with Zn s ubstitution much more rapidly than in samples without excess oxygen. T he effect of Zn substitution on the metamagnetic M vs. H transition is discussed, analyzing the temperature dependence of both the critical field H-c and the weak ferromagnetic moment M(s) for different composi tions x.