Thermoelectric power of YBa2Cu3O7-': Phonon drag and multiband conduction

J. L. Cohn, S. A. Wolf, V. Selvamanickam, K. Salama

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


We report measurements of the a-b-plane thermopower (S) on crystalline YBa2Cu3O7-' (0.16) for temperatures below 310 K. Much sharper features in the T dependence of S are observed than have been previously reported. Both the temperature and oxygen-doping dependences of S, which have caused confusion, are consistently accounted for by conventional metallic theory for the first time. Strong phonon drag and two carrier species are indicated, with holes on the planes and electrons on the chains. An anomalous, positive component to S, observed for T<160 K, is attributed to a freeze-out of carrier-phonon umklapp processes involving holes in the CuO2 planes and optical-mode phonons.

Original languageEnglish (US)
Pages (from-to)1098-1101
Number of pages4
JournalPhysical Review Letters
Issue number8
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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