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

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-03-15
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Language
en
Pages
1-7
Series
Physical Review B, Volume 97, issue 11
Abstract
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.
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Viisanen , K L & Pekola , J P 2018 , ' Anomalous electronic heat capacity of copper nanowires at sub-Kelvin temperatures ' , Physical Review B , vol. 97 , no. 11 , 115422 , pp. 1-7 . https://doi.org/10.1103/PhysRevB.97.115422