Phonon-dispersion relations for the symmetric [100], [110], and [111] branches in fcc krypton have been measured by triple-axis neutron spectrometry. Measurements were carried out at 79°K on a single-crystal sample grown from the melt at a pressure of 2.31 kbar.

• Received 10 February 1967

DOI:https://doi.org/10.1103/PhysRevLett.18.548