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Phonon Dispersion of Transverse Basal Plane Modes in Alkali-Graphite Compounds

Published online by Cambridge University Press:  15 February 2011

W. A. Kamitakahara ,
H. Zabel  and
R. M. Nicklow
W. A. Kamitakahara
Affiliation:
Ames Laboratory-USDOE and Dept. of Physics, Iowa State University, Ames, Iowa 50011, USA
H. Zabel
Affiliation:
Dept. of Physics, University of Illinois, Urbana, Illinois 61801, USA
R. M. Nicklow
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
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Abstract

Dispersion curves for low-frequency transverse modes propagating in the basal plane have been measured in the compounds KC8, KC24 and RbC24 by means of neutron inelastic scattering. The acoustic branches show at low q a behavior ω2= Aq2+Bq4 characteristic of layered materials. The optical branches are derived qualitatively from graphite-like optical branches hybridized with new alkali-like branches. In stage 2 compounds, the shear constant C44, which can be obtained by extrapolating the acoustic branch towards q=0, is appreciably smaller than in stage-1 compounds or in pure graphite. At low temperatures, it was noted in KC24 that a frequency gap in the acoustic branch opens up near q=0.6 A-1, corresponding to the Brillouin zone boundary of the low temperature alkali superstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 311
Copyright
Copyright © Materials Research Society 1983

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References

REFERENCES

1. Nicklow, R. M., Wakabayashi, N. and Smith, H. G., Phys. Rev. B 5, 4951 (1972).Google Scholar
2. Wakabayashi, N., Smith, H. G. and Nicklow, R.M., Phys. Rev. B 12, 659 (1975).Google Scholar
3. Al-Jishi, R. and Dresselhaus, G., Phys. Rev. B 26, 4523 (1982);Google Scholar
Leung, S. Y., Dresselhaus, G. and Dresselhaus, M. S., Phys. Rev. B 24, 6083 (1981).Google Scholar
4. Horie, C., Maeda, M. and Kuramoto, Y., Physica 99B, 430 (1980).Google Scholar
5. Zabel, H. and Magerl, A., Phys. Rev. B 25, 2461 (1982).Google Scholar
6. Kamitakahara, W. A., Wada, N. and Solin, S. A., J. de Physique, 42–C6, 311 (1981), and Solid State Comm. (in press).Google Scholar
7. Kamitakahara, W. A. and Zabel, H., accompanying paper in this volume.Google Scholar
8. Zabel, H., Kamitakahara, W. A. and Nicklow, R. M., Phys. Rev. B (in press).Google Scholar
9. Al-Jishi, R. and Dresselhaus, G., private communication.Google Scholar
10. Zabel, H., Jan, Y. M. and Moss, S. C., Physica 99B, 453 (1980).Google Scholar
11. Kambe, N., Dresselhaus, G. and Dresselhaus, M. S., Phys. Rev. B 21, 3491 (1980).Google Scholar
12. Suzuki, M., Ikeda, H., Suematsu, H., Endoh, Y., Shiba, H., and Hutchings, M. T., J. Phys. Soc. Jpn. 49, 671 (1980).Google Scholar
13. Wada, N., Klein, M. V. and Zabel, H., J. de Physique, 42–C6, 350 (1981).Google Scholar
14. Giergel, J., Eklund, P. C. and Boolchand, P., Phys. Rev. B (in press).Google Scholar