Abstract
We performed high resolution measurements of the b*-LA phonon branch of CuGeO3 by inelastic neutron scattering. From the results it was clarified that the b*-LA broad branch reported earlier is composed of two phonon branches with excitation energies very nearby. The second branch close to this b*-LA mode cannot be assigned in the space group Pbmm and it may indicate that a twisting motion of GeO4 tetrahedra couples to the b*-LA mode. This coupling may be an indispensable ingredient for the spin-Peierls transition in CuGeO3.
| Original language | English |
|---|---|
| Pages (from-to) | 1109-1111 |
| Number of pages | 3 |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 60 |
| Issue number | 8 |
| DOIs | |
| State | Published - 1999 |
| Event | Proceedings of the 1998 7th ISSP International Symposium Frontiers in Neutron Scattering Research (ISSP7) - Tokyo, Jpn Duration: Nov 24 1998 → Nov 27 1998 |
Funding
We acknowledge the expert technical assistance provided by Scott Moore, Brent Taylor, S. Watanabe, T. Shibuya, Y. Kawamura, and Y. Shimojo, and the sample preparation assistance provided by T. Kitazawa and Y. Zenitani. A part of this work was done at ORNL under US–Japan Cooperation Program in Neutron Scattering. ORNL is managed for the US DOE by Lockheed Martin Energy Research Corporation under contract DE-AC05-96OR22464. This work was partly supported by a Grant from CREST and the Science Fund of Japan Private School Promotion Foundation.