De Haas-van Alphen Effect of SbCl₅-Graphite Intercalation Compounds. I

Abstract

The effect of cooling rate on the de Haas-van Alphen (dHvA) oscillation and on the in-plane structure has been studied by the use of electron diffraction in the second stage SbCl 5 -graphite intercalation compounds (GIC's). When the cooling rate through the phase transition temperature, 210 K, is fast, a large volume of the regular spot pattern of (\(\sqrt{7}{\times}\sqrt{7}\))R19° and (\(\sqrt{39}{\times}\sqrt{39}\))R16° corresponding to the higher temperature phase remains, while non-negligible volume of the diffuse diffraction pattern of the intercalant corresponding to the low temperature phase appears. Compared with the case of the slow cooling through 210 K, the amplitudes of the dHvA oscillation were found to increase without changing their frequencies. Even in the case of slowest cooling, the crystal-line phase pattern remained definitely. These facts have removed such an apparent controversy that the glassy phase of the material at low temperature should yield many kinds of dHvA oscillation frequencies.