| Autor: |
Krauzman, M., Debeau, M., Pick, R. M., Quilichini, M., Launois, P., Moussa, F., Krauzman, M., Debeau, M., Pick, R. M., Quilichini, M., Launois, P., Moussa, F. |
| Zdroj: |
Journal de Physique I; March 1992, Vol. 2 Issue: 3 p329-351, 23p |
| Abstrakt: |
The low frequency dynamics related to the second order transition which takes place in ammonium deuterated oxalate has been investigated by coherent inelastic neutron scattering. This transition leads to a ferroelastic phase at zero presure and to an incommensurate phase at 5kbar. At both pressures, our experiments show that the coupling between a reorientation motion of one family of ND+4ions and the TA phonons propagating along c*and polarized along adrives the transition, the ND4+being coupled through a pressure dependent ANNNI model. Weak changes in the parameters explain the changes with pressure of the static and dynamical properties of the transition. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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