Study of inelastic neutron scattering and by the Raman effect, of the soft mode in the prototype phase of Hg<sub>2</sub>Cl<sub>2</sub>
J P Benoit; Cao Xuan An; Y Luspin; J P Chappelle; J Lefebvre; J P Benoit; Lab. de Phys. Cristalline, Univ. de Paris, Orsay, France; Cao Xuan An; Lab. de Phys. Cristalline, Univ. de Paris, Orsay, France; Y Luspin; Lab. de Phys. Cristalline, Univ. de Paris, Orsay, France; J P Chappelle; Lab. de Phys. Cristalline, Univ. de Paris, Orsay, France; J Lefebvre; Lab. de Phys. Cristalline, Univ. de Paris, Orsay, France
Журнал:
Journal of Physics C: Solid State Physics
Дата:
1978-09-14
Аннотация:
Preliminary experiments of inelastic neutron scattering confirm the hypothesis that the purely ferroelastic transition in Hg<sub>2</sub>Cl<sub>2</sub> is induced by the condensation of a transversal acoustical model at one * point of the first Brillouin zone in the tetragonal phase. Second-order Raman spectra show that the frequency of the soft mode in the prototype phase is given by the relation nu <sup>2</sup>=0.35 (T-184)(cm<sup>-1</sup>)<sup>2</sup>.
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