Abstract
Cuprite crystals, Cu2O and Ag2O, display a negative thermal expansion in a wide temperature range. This work shows, through a phenomenological approach, how the next-nearest-neighbors dynamics observed by EXAFS in both crystals [A. Sanson, F. Rocca, G. Dalba, P. Fornasini, R. Grisenti, M. Dapiaggi, G. Artioli, Phys. Rev. B 73 (2006), 214305] is directly connected to a tension mechanism. As a result, the negative thermal expansion in cuprite crystals could be described within the Rigid Unit Modes formalism, but replacing the typical rigid polyhedral units by rigid rods between nearest-neighbors atoms.
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