Intercalant ordering in the stage-1 indium chloride graphite intercalation compound

Abstract

The stage-1 InCl 3 graphite intercalation compound (GIC) was studied by the de Haas-van Alphen (dHvA) effect in the temperature range 1.4 to 4.2 K with magnetic fields from 3 to 5 T. The observed dHvA oscillations possess frequencies of f 1 = 263 T, f 2 = 458 T, f 3 = 705 T and f 4 = 878 T. They are shown to result from Fermi surface pieces which are constructed from the zone folding of the two-dimensional free electron Fermi surface. The fragmentation of the Fermi surface is shown to be a consequence of the additional periodicity of a commensurate (8• in-plane superlattice formed by the InCl 3 molecules. This ordering of InCl 3 molecules is a result of a phase transition which occurs upon cooling at approximately 260 K. This transition was identified by temperature dependent resistivity studies and by differential thermal analysis (DTA) of the stage-1 InCl 3 GIC sample.

Carrier orbit coupling in stage-2 IBr graphite

“…The zone-folding effect has been detected experimentally in stage-1 InCl 3 GIC [11], stage-2 InCl 3 GIC [12] and stage-2 SbCl 5 GIC [13]. For the stage-2 InCl 3 GIC [12] the dHvA frequencies were in the range 126-1424 T and the cyclotron masses were between 0.095 and 0.27 m 0 .…”

“…The experimental results obtained with apparatus which has been described previously [11] are given in section 2. The analysis using zone folding is described in section 3.…”