May, T. and Müller, W. and Strauch, Dieter (1998) Anharmonic lattice dynamics and neutron-scattering spectra in bcc transition metals. PHYSICAL REVIEW B, 57 (10). pp. 5758-5763. ISSN 1098-0121, 1550-235X
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Anharmonic phonon-phonon coupling strengths have been derived from a simple phenomenological model potential in order to explain the characteristic phonon linewidths and lineshifts and inelastic neutron spectra of bcc metals in their high-temperature phase. The strong quasielastic scattering near q=2/3(111) and q=1/2(110) in bcc Zr and bcc Ti is actually caused by anharmonic broadening, with the lifetime of these low-frequency phonons of the order of a vibrational period. These modes which are connected to the structural phase transition from the bcc to the hexagonal or the hcp phase show the strongest anharmonic effects. The interference between one-and two-phonon neutron-scattering processes leads to an unusually strong intensity variation over adjacent Brillouin zones.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GROUP-IV METALS; PHONON-DISPERSION; PHASE; ZIRCONIUM; ZR |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Alumni or Retired Professors > Group Dieter Strauch |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Feb 2023 07:54 |
| Last Modified: | 28 Feb 2023 07:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50065 |
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