Evidence for strong Coulomb correlations in an organic conductor

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

doi:10.1103/PhysRevLett.42.1178

Evidence for strong Coulomb correlations in an organic conductor

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

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English (US)
Pages (from-to)	1178-1182
Number of pages	5
Journal	Physical Review Letters
Volume	42
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.42.1178
State	Published - 1979

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.42.1178

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AU - Kwak, J. F.

AU - Epstein, A. J.

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AB - 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.

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Evidence for strong Coulomb correlations in an organic conductor

Abstract

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