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32. Shubnikov-de haas experiments in graphite donor intercalation compounds
128
Abstracts
MA 02139). We have measured the magnetic susceptibility of Stage 1, 2, 4 and 6 FeCls intercalated graphite in the temperature range between 1 and 4.2K both parallel and normal to the c-axis and find that there is a susceptibility maximum which occurs between 1.63 and 1.72K in all the samples. The maximum is enhanced in the higher stages and is more intense normal to the c-axis. The susceptibility was measured at 43 and 200 Hz and in both cases an accompanying maximum in the out of phase susceptibility was observed at temperatures slightly below those of the in phase maximum.
29. Low temperaturespecific heat and low field magnetfc susceptibility of second stage Nit&- and FeCbcomponndst David G. Onn, M. Grayson Alexander (Department of Physics, Universityof Delaware, Newark DE 19710, J. J. Ritsko (Xerox Webster Research Center, Webster, NY), and Serge Flandrois (Centre de Recherche Paul Pascal, Universite de Bordeaux I, Domaine Universitaire, 33405 Talence, France). Low field susceptibility and low temperature specific heat of the second stage powder graphite intercalation compound, C, 1.3NiC12.L3 will be reported. Results will be analyzed in terms of possible magnetic models for this material. The specific heat of the second stage graphite intercalation compound with FeCl, has been measured from 1.2 to 1OOK.The electronic, lattice and magnetic contributions will be discussed. tThis work was supported in part by AFOSR Grant No. 77-3393and its continuations. 30. Effect of carrier-carrierscatteringon the Hall effect of CrM Ko Sugihara (Materials Research Laboratory, Matsushita Electric Indust. Co., Ltd., Moriguchi, Osaka 570, Japan). According to the measurements on Hall coefficient R of C,M (M = K, Rb, Cs) by Pennsylvania group, R changes its sign from positive to negative with increasing temperatures. This behavior is explained in consideration of carrier-carrier scattering and the same mechanism is responsible for the T* term in resistivity.
(Massachusetts Institute of Technology, Center for Material Science and Engineering 13-3017, Cambridge, MA 02139). The Fermi surface model is tested against detailed data on the stage dependence of the SdH frequencies in the graphite-alkali metal intercalation compounds. The effect of bounding layer-intercalate layer interactions on the Fermi surface and on the k, dispersion of the levels is included.
33. EIectronicpropertiesof PdC12and CuC12intercalated natnrai single crystals, HOPG and pitch based carbon fibers Hisashi Oshima, John A. Woollam, A. Azim Khan, Edward J. Haugland, Michael B. Dowel1 and Bruce Brandt (Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588). The magnitude and temperature dependence of the electrical resistivity of CuC12intercalated carbon fibers is presented. Fibers had varying heat treatment temperatures up to 3000°C. Intercalations were done under varying time and temperature conditions, and these are correlated with electrical results for measurement temperatures up to 450K.
34. Interband Landau level transitions in graphite intercalation compounds T. C. Chieu, M. S. Dresselhaus and G. Dresselhaus (M.I.T., Center for Material Science and Engineering 33-2090,Cambridge, MA 02139). We report a calculation of interband Landau level transitions in graphite intercalation compounds, based on graphite P-bands, appropriately folded along k, to satisfy the staging periodicity of the intercalation compounds. The model calculation is applied to the interpretation of magnetoreflection spectra, yielding values for the intercalantgraphite bounding layer interaction, the K-point effective masses and the Fermi level shifts for specific intercalation compounds.
35. Optical reflectivity studies of the lithium-graphite intercalation compounds P. Pfluger, E. Schupfer, R. Lapka and H.-J. Giin31. Low field magnetoresistanceof graphfteferric-chloride therodt (The Universityof Basel, Department of Physics, CH-4056 Base& Switzerland). We present the results of compounds R. A. Wachnik, L. A. Pendrys and F. L. Vogel absolute optical reflectivity measurements on Lithium (Department of Materials Science and Engineering, Uni- Graphite Intercalation Compounds (Li-GIG’s) of stages versity of Pennsylvania, Philadelphia, PA 19104). Mag- l-4. The data are analyzed in terms of a phenomenolonetoresistance measurements are presented for stages 1, gical model for the dielectric function 2(w) = e,(o) t h(w), similar to the one proposed by Eklund et 2, 3, 4, 6 for graphite-FeCl,. Results are interpreted al. for the analysis of SbC&-GIG’s (l), but slightly using a two band model and compared with other measurements. The results will be compared with similar modified. measurements on the compounds Cen SbFJ, Cs. AsFS.
32. Shubnikov-de Haas experiments in graphite donor fntercafatbn compounds M. Shayegan, M. S. Dresselhaus and G. Dresselhaus
36. Dielectric functfon of boron-dopedgraphite M. E. Preil, D. P. DiVencenzo, Robert C. Tatar and J. E. Fischer (University of Pennsylvania, Philadelphia, PA 19104). (Abstract not submitted).
Abstracts
MA 02139). We have measured the magnetic susceptibility of Stage 1, 2, 4 and 6 FeCls intercalated graphite in the temperature range between 1 and 4.2K both parallel and normal to the c-axis and find that there is a susceptibility maximum which occurs between 1.63 and 1.72K in all the samples. The maximum is enhanced in the higher stages and is more intense normal to the c-axis. The susceptibility was measured at 43 and 200 Hz and in both cases an accompanying maximum in the out of phase susceptibility was observed at temperatures slightly below those of the in phase maximum.
29. Low temperaturespecific heat and low field magnetfc susceptibility of second stage Nit&- and FeCbcomponndst David G. Onn, M. Grayson Alexander (Department of Physics, Universityof Delaware, Newark DE 19710, J. J. Ritsko (Xerox Webster Research Center, Webster, NY), and Serge Flandrois (Centre de Recherche Paul Pascal, Universite de Bordeaux I, Domaine Universitaire, 33405 Talence, France). Low field susceptibility and low temperature specific heat of the second stage powder graphite intercalation compound, C, 1.3NiC12.L3 will be reported. Results will be analyzed in terms of possible magnetic models for this material. The specific heat of the second stage graphite intercalation compound with FeCl, has been measured from 1.2 to 1OOK.The electronic, lattice and magnetic contributions will be discussed. tThis work was supported in part by AFOSR Grant No. 77-3393and its continuations. 30. Effect of carrier-carrierscatteringon the Hall effect of CrM Ko Sugihara (Materials Research Laboratory, Matsushita Electric Indust. Co., Ltd., Moriguchi, Osaka 570, Japan). According to the measurements on Hall coefficient R of C,M (M = K, Rb, Cs) by Pennsylvania group, R changes its sign from positive to negative with increasing temperatures. This behavior is explained in consideration of carrier-carrier scattering and the same mechanism is responsible for the T* term in resistivity.
(Massachusetts Institute of Technology, Center for Material Science and Engineering 13-3017, Cambridge, MA 02139). The Fermi surface model is tested against detailed data on the stage dependence of the SdH frequencies in the graphite-alkali metal intercalation compounds. The effect of bounding layer-intercalate layer interactions on the Fermi surface and on the k, dispersion of the levels is included.
33. EIectronicpropertiesof PdC12and CuC12intercalated natnrai single crystals, HOPG and pitch based carbon fibers Hisashi Oshima, John A. Woollam, A. Azim Khan, Edward J. Haugland, Michael B. Dowel1 and Bruce Brandt (Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588). The magnitude and temperature dependence of the electrical resistivity of CuC12intercalated carbon fibers is presented. Fibers had varying heat treatment temperatures up to 3000°C. Intercalations were done under varying time and temperature conditions, and these are correlated with electrical results for measurement temperatures up to 450K.
34. Interband Landau level transitions in graphite intercalation compounds T. C. Chieu, M. S. Dresselhaus and G. Dresselhaus (M.I.T., Center for Material Science and Engineering 33-2090,Cambridge, MA 02139). We report a calculation of interband Landau level transitions in graphite intercalation compounds, based on graphite P-bands, appropriately folded along k, to satisfy the staging periodicity of the intercalation compounds. The model calculation is applied to the interpretation of magnetoreflection spectra, yielding values for the intercalantgraphite bounding layer interaction, the K-point effective masses and the Fermi level shifts for specific intercalation compounds.
35. Optical reflectivity studies of the lithium-graphite intercalation compounds P. Pfluger, E. Schupfer, R. Lapka and H.-J. Giin31. Low field magnetoresistanceof graphfteferric-chloride therodt (The Universityof Basel, Department of Physics, CH-4056 Base& Switzerland). We present the results of compounds R. A. Wachnik, L. A. Pendrys and F. L. Vogel absolute optical reflectivity measurements on Lithium (Department of Materials Science and Engineering, Uni- Graphite Intercalation Compounds (Li-GIG’s) of stages versity of Pennsylvania, Philadelphia, PA 19104). Mag- l-4. The data are analyzed in terms of a phenomenolonetoresistance measurements are presented for stages 1, gical model for the dielectric function 2(w) = e,(o) t h(w), similar to the one proposed by Eklund et 2, 3, 4, 6 for graphite-FeCl,. Results are interpreted al. for the analysis of SbC&-GIG’s (l), but slightly using a two band model and compared with other measurements. The results will be compared with similar modified. measurements on the compounds Cen SbFJ, Cs. AsFS.
32. Shubnikov-de Haas experiments in graphite donor fntercafatbn compounds M. Shayegan, M. S. Dresselhaus and G. Dresselhaus
36. Dielectric functfon of boron-dopedgraphite M. E. Preil, D. P. DiVencenzo, Robert C. Tatar and J. E. Fischer (University of Pennsylvania, Philadelphia, PA 19104). (Abstract not submitted).