Magnetization and Magnetoresistance Measurements in GdBaCo2−xNixO5.5

The magnetization measurements in GdBaCo2−xNixO5.5. were carried out in a home built SQUID magnetometer developed using a DC SQUID sensor and its associated readout flux locked loop electronics. Magnetotransport measurements were also carried out on this system. The results suggest that TC decreases with Ni substitution and for x 0.3 a FM state is stabilized.