Publication
Physical Review B
Paper

Theory of order-disorder transitions in the graphite intercalation compounds C8Cs, C8Rb, and C6Li

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Abstract

The order-disorder transitions in the stage-1 graphite intercalation compounds C8Cs, C8Rb, and C6Li are analyzed within a Landau-Ginzburg theory. The transitions are all found to be first order, but for different reasons: In C8Cs the Landau expansion includes third-order umklapp terms, whereas in C8Rb the ordered phase is stablized by sixth-order anisotropy terms. The transition in C6Li is described by the three-dimensional three-state Potts model, which also contains cubic invariants. Experiments are suggested to test the predictions. © 1979 The American Physical Society.

Date

01 Oct 1979

Publication

Physical Review B

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