Refereed Articles
Large Low Temperature Specific Heat in the Negative Thermal Expansion Compound ZrW2O8
  The specific heat C(T) of ZrW2O8 is measured from 1 to 300 K. Below 50 K, C(T) is dominated by an Einstein term of energy ħω0≈5 meV, which represents 6.5% of the total lattice degrees of freedom. This concentration of phonon spectral weight at low energies is unusual in materials of cubic structure and is a possible indication of “rigid unit modes” discussed for underconstrained crystal structures. The relationship between C(T) and the large negative thermal expansion in this compound is discussed.  
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  Large Low Temperature Specific Heat in the Negative Thermal Expansion Compound ZrW2O8. A. P. Ramirez, G. R. Kowach, Phys. Rev. Lett. 1998, 80, 4903.