Phys. Rev. Lett. 79, 4846–4849 (1997)Phonon Softening and Lattice Melting at the Ferroelastic Phase Transition in Na2CO3Received 6 June 1997; published in the issue dated 15 December 1997 We present the results of a detailed inelastic neutron scattering study of the dynamics of the ferroelastic phase transition in Na2CO3. The driving instability is a transverse acoustic mode that softens over a plane of wave vectors, resulting in a continuous loss of long-range order, in accord with theoretical predictions. At Tc a wide distribution of excitations is observed in the plane of critical wave vectors, similar to the dynamics of a liquid. Perpendicular to this plane the system possesses one-dimensional order. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.4846
DOI:
10.1103/PhysRevLett.79.4846
PACS:
64.70.Dv, 61.12.Ex, 63.70.+h
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