Anomalous electronic heat capacity of copper nanowires at sub-Kelvin temperatures

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We have measured the electronic heat capacity of thin film nanowires of copper and silver at temperatures 0.1-0.3 K; the films were deposited by standard electron-beam evaporation. The specific heat of the Ag films of sub-100-nm thickness agrees with the bulk value and the free-electron estimate, whereas that of similar Cu films exceeds the corresponding reference values by one order of magnitude. The origin of the anomalously high heat capacity of copper films remains unknown for the moment. Based on the small heat capacity at low temperatures and the possibility to devise a tunnel probe thermometer on it, metal films form a promising absorber material, e.g., for microwave photon calorimetry.


Original languageEnglish
Article number115422
Pages (from-to)1-7
JournalPhysical Review B
Issue number11
Publication statusPublished - 15 Mar 2018
MoE publication typeA1 Journal article-refereed

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