Investigation of the low-temperature thermoelectric properties of tungsten by a field-nulling technique

J. C. Garland, D. J. Vanharlingen

Research output: Contribution to journalArticle

Abstract

The thermoelectric dc transport properties of five single-crystal tungsten samples have been measured over the temperature range 1.2-7 K. In addition to the electrical resistivity, thermal resistivity, and thermoelectric power, a new thermoelectric function G (T) was determined; the properties of this function and the method for measuring it are analyzed. Evidence for electron-phonon scattering was observed for both the electrical and thermal resistivity, appearing as a deviation from a quadratic temperature dependence usually associated with the electron-electron interaction. The thermoelectric coefficients S (T) and G (T) were positive below about 5 K for all samples with a sign reversal occurring at higher temperatures. Below 3 K, a marked impurity dependence in the thermoelectric properties was observed. No sample exhibited the characteristic temperature dependence of electron-electron scattering. The sign reversal at higher temperatures is attributed to the onset of a phonon-drag mechanism.

Original languageEnglish (US)
Pages (from-to)4825-4841
Number of pages17
JournalPhysical Review B
Volume10
Issue number12
DOIs
StatePublished - Jan 1 1974
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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