Phys. Rev. Lett. 80, 4903–4906 (1998)Large Low Temperature Specific Heat in the Negative Thermal Expansion Compound ZrW2O8Received 5 February 1998; published in the issue dated 1 June 1998 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≈5meV, 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. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.4903
DOI:
10.1103/PhysRevLett.80.4903
PACS:
63.20.Ry, 65.40.+g
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