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Organic charge transfer salts exhibit thermal expansion anomalies similar tothose found in other strongly correlated electron systems. The thermalexpansion can be anisotropic and have a non-monotonic temperature dependence.We show how these anomalies can arise from electronic effects and besignificantly enhanced, particularly at temperatures below 100 K, by strongelectronic correlations. For the relevant Hubbard model the thermal expansionis related to the dependence of the entropy on the parameters ($t$, $t'$, and$U$) in the Hamiltonian or the temperature dependence of bond orders and doubleoccupancy. The latter are calculated on finite lattices with the FiniteTemperature Lanczos Method. Although many features seen in experimental data,in both the metallic and Mott insulating phase, are described qualitatively,the calculated magnitude of the thermal expansion is smaller than that observedexperimentally.

Enhancement of the thermal expansion of organic charge transfer salts by strong electronic correlations