Evidence for strong Coulomb correlations in an organic conductor

P. M. Chaikin, J. F. Kwak, A. J. Epstein

    Research output: Contribution to journalArticlepeer-review


    The thermopower of highly conducting quarter-filled-band TCNQ (tetracyanoquinodimethane) salts corresponds to an entropy per carrier of k ln2. We have measured the change of the thermoelectric power upon application of a magnetic field for quinolinium ditetracyanoquinodimethane. We find an isotropic shift which agrees with the entropy change of a free-spin system. Coupled with the observation of a negligibly small magnetoresistance, this provides definite evidence that the conducting electrons are correlated as in the strong-coupling Hubbard model.

    Original languageEnglish (US)
    Pages (from-to)1178-1182
    Number of pages5
    JournalPhysical Review Letters
    Issue number17
    StatePublished - 1979

    ASJC Scopus subject areas

    • General Physics and Astronomy


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