Magnetic susceptibility of- and-graphite intercalation compounds
- 1 December 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 34 (11) , 7951-7957
- https://doi.org/10.1103/physrevb.34.7951
Abstract
The dc magnetic susceptibilities of -graphite intercalation compounds (GIC’s) (stages 1 and 2) and -GIC’s (stages 1, 2, and 3) were measured between 2 and 300 K for external field orientations both perpendicular and parallel to the c axis. -GIC obeys a Curie-Weiss law for both orientations above 20 K, with g factors close to the spin-only value of 2.0 for both stages. The measured Curie-Weiss temperatures indicate a net antiferromagnetic intraplanar exchange interaction, with a small XY anisotropy appearing below about 50 K. -GIC, in contrast, exhibits considerable XY anisotropy at all temperatures. The susceptibility perpendicular to the C axis has been fit to a Curie-Weiss law above 120 K, yielding a stage-dependent ferromagnetic intraplanar exchange (J=10.4, 7.7, and 6.8 K for stages 1, 2, and 3, respectively). The susceptibility parallel to the c axis contains a very large temperature-independent term which can be attributed to Van Vleck paramagnetism.
Keywords
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