Magnetization Measurements of the Second Stage NiCl2-Graphite Intercalation Compound

Abstract

We have investigated the induced ( M ) and residual ( M r ) magnetizations in the 2nd stage NiCl 2 -graphite intercalation compound at 4.2 to 300 K in the fields of 0.1 to 4.5×10 4 Oe with using the well-staged single crystal samples. Two successive magnetic phase transitions have been observed at T c1 =17.5 K and T cu =22.0 K. Above T cu the compound is paramagnetic with θ=70±1 K and µ eff =3.29 µ B . In the intermediate phase ( T c1 T cu ) to 2.0( T 10 Oe. These results suggest the existence of an ordered state at...