Abstract
Lattice dynamics of La11B6 was studied on the neutron triple axis spectrometers at HFIR. The acoustic and optical modes were measured in the high symmetry directions. The rotary motion of the B6 molecule was measured only near the zone boundaries but shows no softening. Instead, very flat low frequency La modes were observed. The agreement with the elastic constants and the temperature dependence of specific heat is satisfactory. In YbB6, the elastic constants and specific heat were measured. Both results give the quite different feature from those of LaB6, no softening of C12 and more softened flat low frequency Yb modes, due to the lack of the metallic bonds.
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