Galvanomagnetic,Optical Properties and Ultraviolet Photoelectron Spectra of Potassium-Oxygen-Graphite Intercalation Compounds

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We investigated the Hall efl'ect, the transverse rnagnetoresistance, the optical reflectivity andthe trltraviolet photoelectron spectra for lst and 2nd stage K0.-GICs (C,j.KO., stage rrunabern : l, 2; xx2) in order to clarify the transport properties and the electronic structures. The Halleffect and the magnetoresistance indicate that the electrical conduction in K0.-GICs is governedby the majority electron carriers with low mobility in graphitic rc bands and the minority holecarriers with high mobility in the intercalate bands, the latter of which originates mainly fromthe oxygen bands as suggested by the incident photon energy dependence of the ultravioletphotoelectron spectra. The optical reflectance spectra give the estimates of the Ferrni energues,1.9 eV and 1.35 eV for lst and 2nd stage conapotrnds, respectively, on the basis of the Drtrde-Lorentz naodel. The contribution of the intercalate hole carriers to the plasma frequency is stnallin good agreement with the Hall effect indicating the presence of nuinority hole carriers. Theseexperimental findings suggest the contribtrtion of the intercalate layer to the transport propertiesand the electronic strtrcttrre around the Fertni level.
社団法人日本物理学会の論文
1997-01-15