The effect of niobium thin film structure on losses in superconducting circuits
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00643819" target="_blank" >RIV/68378271:_____/25:00643819 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0374807" target="_blank" >https://hdl.handle.net/11104/0374807</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/2633-4356/ae1347" target="_blank" >10.1088/2633-4356/ae1347</a>
Alternative languages
Result language
angličtina
Original language name
The effect of niobium thin film structure on losses in superconducting circuits
Original language description
The performance of superconducting microwave circuits is strongly influenced by the material properties of the superconducting film and substrate. While progress has been made in understanding the importance of surface preparation and the effect of surface oxides, the complex effect of superconductor film structure on microwave losses is not yet fully understood. In this study, we investigate the microwave properties of niobium resonators with different crystalline properties and related surface topographies. We analyze a series of magnetron sputtered films in which the Nb crystal orientation and surface topography are changed by varying the substrate temperatures between room temperature and 975 K. The lowest-loss resonators that we measure have quality factors of over 106 at single-photon powers, among the best ever recorded using the Nb on sapphire platform. We observe the highest quality factors in films grown at an intermediate temperature regime of the growth series (550 K) where the films display both preferential ordering of the crystal domains and low surface roughness. Furthermore, we analyze the temperature-dependent behavior of our resonators to learn about how the quasiparticle density in the Nb film is affected by the niobium crystal structure and the presence of grain boundaries. Our results stress the connection between the crystal structure of superconducting films and the loss mechanisms suffered by the resonators and indicate that even a moderate change in temperature during thin film deposition can significantly affect the resulting quality factors.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials for Quantum Technology
ISSN
2633-4356
e-ISSN
2633-4356
Volume of the periodical
5
Issue of the periodical within the volume
4
Country of publishing house
GB - UNITED KINGDOM
Number of pages
24
Pages from-to
041001
UT code for WoS article
001599057400001
EID of the result in the Scopus database
2-s2.0-105019740476