Abstract
Measurements of the specific heat of the crystalline metallic polymer ${(\mathrm{SN})}_{x}$ are reported for the temperature range $1.5\ensuremath{\le}T\ensuremath{\le}80$ \ifmmode^\circ\else\textdegree\fi{}K. The lattice contribution to the specific heat deviates from Debye behavior near 4\ifmmode^\circ\else\textdegree\fi{}K, changing from ${T}^{3}$ to ${T}^{2.7}$ and then to a $T$ dependence as temperature increases. The anisotropy in force constants which cause this behavior is discussed in relation to the crystal structure of ${(\mathrm{SN})}_{x}$. From the electronic contribution to the specific heat we estimate an electron band-structure density of states at the Fermi level of 0.14 states/(eV spin molecule).
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