Resonance phenomena in a phonon subsystem in connection with anomalies of the structural state of metals
Katsnel'son M. I. , Trefilov A. V.
Anomalies in the quasielastic scattering of neutrons in crystals may be caused by resonances in the phonon spectrum. For example, the features recently observed in the structural state of potassium are interpreted as charge-density waves which are associated with a 1:3 multiple relationship between phonon frequencies at the corresponding point in the Brillouin zone and a synchronization ("locking") of the phases of phonons. Manifestations of locking in lattice dynamics are discussed (a splitting of phonon frequencies and the threshold nature of quasielastic scattering) in the example of the bcc phases of К and Zr. Anomalies are predicted in the quasielastic scattering of bcc and fee metals.
Home
![](/ps/1245/article_18837_800_head.png "Anomalies in the quasielastic scattering of neutrons in crystals may be caused by resonances in the phonon spectrum. For example, the features recently observed in the structural state of potassium are interpreted as charge-density waves which are associated with a 1:3 multiple relationship between phonon frequencies at the corresponding point in the Brillouin zone and a synchronization ("locking") of the phases of phonons. Manifestations of locking in lattice dynamics are discussed (a splitting of phonon frequencies and the threshold nature of quasielastic scattering) in the example of the bcc phases of К and Zr. Anomalies are predicted in the quasielastic scattering of bcc and fee metals.")