Soft Manifold Dynamics Behind Negative Thermal Expansion

Details Soft Manifold Dynamics Behind Negative Thermal Expansion Soft Manifold Dynamics Behind Negative Thermal Expansion

2008-07-08

arxiv.org/abs/0807.1286v1

Phys. Rev. Lett. 101, 015501 (2008)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.015501

Minimal models are developed to examine the origin of large negative thermal expansion (NTE) in under-constrained systems. The dynamics of these models reveals how underconstraint can organize a thermodynamically extensive manifold of low-energy modes which not only drives NTE but extends across the Brillioun zone. Mixing of twist and translation in the eigenvectors of these modes, for which in ZrW2O8 there is evidence from infrared and neutron scattering measurements, emerges naturally in our model as a signature of the dynamics of underconstraint.

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