Successive magnetic phase transitions in high-stage MoCl5-graphite intercalation compounds

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Abstract
The magnetic phase transitions of high-stage MoCl5-graphite intercalation compounds have been investigated by magnetic susceptibility and spontaneous magnetisation measurement in the temperature range 16 mKcl and Tcu. The upper transition temperature Tcu is not dependent on the stage number (N) of these compounds (Tcu=1.60K), which suggests that the magnetic ordering between Tcl and Tcu is two-dimensional. The lower transition temperature Tcl shifts to lower temperatures as the stage number increases from 3 to 5 (Tcl=690 mK for N=3, 500 mK for N=4 and 400 mK for N=5), which gives an evidence for the three-dimensional magnetic ordering below Tcl.