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Phonon softening and lattice melting at the ferroelastic phase transition in Na2CO3

Harris, MJ; McMorrow, DF; Godfrey, KW; (1997) Phonon softening and lattice melting at the ferroelastic phase transition in Na2CO3. PHYS REV LETT , 79 (24) 4846 - 4849.

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Abstract

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 T-c 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.

Type: Article
Title: Phonon softening and lattice melting at the ferroelastic phase transition in Na2CO3
Keywords: NEUTRON-SCATTERING, SINGLE-CRYSTAL, ORDER
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/60086
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