Experimental validation of the interfacial form of the Wiedemann-Franz law

R. B. Wilson, David G Cahill

Research output: Contribution to journalArticle

Abstract

The thermal conductivity of four Pd/Ir metal multilayers of total thickness 390 nm with 40, 80, 120, and 200 Pd/Ir interfaces are measured at temperatures between 78 and 295 K using time-domain thermoreflectance. The thermal interface conductance G of the Pd/Ir interface is derived from the differences in thermal conductivity between the multilayers. A comparison of G to previously reported data for the electronic specific resistance of the Pd/Ir interface at 4 K supports the validity of the interfacial form of the Wiedemann-Franz law. The Lorenz number deduced from this comparison is within 10% of the Sommerfeld value at all temperatures, well within the experimental uncertainties of 20%.

Original languageEnglish (US)
Article number255901
JournalPhysical review letters
Volume108
Issue number25
DOIs
StatePublished - Jun 19 2012

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thermal conductivity
temperature
electronics
metals

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Experimental validation of the interfacial form of the Wiedemann-Franz law. / Wilson, R. B.; Cahill, David G.

In: Physical review letters, Vol. 108, No. 25, 255901, 19.06.2012.

Research output: Contribution to journalArticle

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AB - The thermal conductivity of four Pd/Ir metal multilayers of total thickness 390 nm with 40, 80, 120, and 200 Pd/Ir interfaces are measured at temperatures between 78 and 295 K using time-domain thermoreflectance. The thermal interface conductance G of the Pd/Ir interface is derived from the differences in thermal conductivity between the multilayers. A comparison of G to previously reported data for the electronic specific resistance of the Pd/Ir interface at 4 K supports the validity of the interfacial form of the Wiedemann-Franz law. The Lorenz number deduced from this comparison is within 10% of the Sommerfeld value at all temperatures, well within the experimental uncertainties of 20%.

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