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

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 differen...

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Bibliographic Details
Published in:Physical review letters 2012-06, Vol.108 (25), p.255901-255901, Article 255901
Main Authors: Wilson, R B, Cahill, David G
Format: Article
Language:English
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Summary: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%.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.255901