Abstract
The temperature dependences (0.8 K ⩽ T < 7 K) of the specific heats of pure polyacetylene (both cis and trans isomers) and heavily doped metallic [CH(AsF 5) 0.12] X are reported. Results for undoped cis -(CH) X indicate behavior typical of crystalline polymers, whereas isomerization to the trans -form leads to a small term linear in temperature signifying increased disorder. Comparison of the data from cis and trans starting material indicates that isomerization is induced during doping. The increased coefficient of the linear term in the metallic polymer is discussed in terms of two contributions; an electronic term expected for a metal, and the increased effect of disorder in the doped polymer.
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