Phonon-dominated thermal conductivity of a superconducting amorphous MoSi thin film
Abstract
We use the differential 3ω method to directly measure the temperature dependent thermal conductivity for about 90 nm Mo0.78Si0.22 thin films. The measurements are performed in a closed-cycle cryostat to access the temperature range between 50 K and 300 K. The MoSi thin films are capped with Al2O3 and probed with a Pt wire. The results show that the thermal conductivity does not satisfy the Wiedemann-Franz law. This implies that thermal transport in MoSi is not dominated by electrons but by phonon-like excitations, contrary to what is assumed in many electro-thermal models of superconducting devices. We argue that this property might be related to the weak localization visible in the resistivity as a function of temperature curves of the superconductor.
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BibTeX
@misc{chiesa2026phonondominated,
title = {{Phonon-dominated thermal conductivity of a superconducting amorphous MoSi thin film}},
author = {Jacopo Piantanida Chiesa and Tom Q. Post and Martin P. van Exter and Michiel J. A. de Dood},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.26136},
eprint = {2610.26136},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.26136},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Phonon-dominated thermal conductivity of a superconducting amorphous MoSi thin film
AU - Jacopo Piantanida Chiesa
AU - Tom Q. Post
AU - Martin P. van Exter
AU - Michiel J. A. de Dood
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.26136
UR - https://arxiv.org/abs/2610.26136
AB - We use the differential 3ω method to directly measure the temperature dependent thermal conductivity for about 90 nm Mo0.78Si0.22 thin films. The measurements are performed in a closed-cycle cryostat to access the temperature range between 50 K and 300 K. The MoSi thin films are capped with Al2O3 and probed with a Pt wire. The results show that the thermal conductivity does not satisfy the Wiedemann-Franz law. This implies that thermal transport in MoSi is not dominated by electrons but by phonon-like excitations, contrary to what is assumed in many electro-thermal models of superconducting devices. We argue that this property might be related to the weak localization visible in the resistivity as a function of temperature curves of the superconductor.
ER -