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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| Published in | Physical review letters Vol. 108; no. 25; p. 255901 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
19.06.2012
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| Online Access | Get more information |
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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%. |
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| ISSN: | 1079-7114 |
| DOI: | 10.1103/physrevlett.108.255901 |