Magnetic measurements were performed on a Quantum Design MPMS3 SQUID magnetometer. The magnetic field applied by the superconducting magnet was calibrated at 298 K using a standard palladium sample with known magnetic moment. Sweeping from +70 kOe to "zero field", in fact corresponded to -22 Oe or -23 Oe, and thus all magnetisation decays were performed in a target field of +22 Oe or +23 Oe to correct for this.