Abstract
The magnetic phase transitions in a second-stage CoCl 2-graphite intercalation compound based on a single crystal of Kish graphite have been investigated by elastic neutron scattering, magnetization, magnetic susceptibility, and specific heat measurements. This compound shows two successive magnetic phase transitions at Tincl and T cu ( T cl = 8.0 K and T cu = 9.1 K). The high temperature phase above T cu is the paramagnetic state. The intermediate phase between T cl and T cu is some ordered state with a small, but finite magnetization. The low temperature phase below T cl is the antiferromagnetic ordered state with the easy axis of spins lying in the c-plane where the magnetic ordering has three-dimensional character.
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