Effects of alloying and deposition temperature on phase formation and superconducting properties of TiZrTaNb-based high entropy-alloy films
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A variety of bulk high-entropy alloy superconductors have been recently discovered; however, for thin films, only the TaNbHfZrTi high-entropy alloy system has been investigated for its superconducting properties. Here, (TiZrNbTa)1−xWx and (TiZrNbTa)1−xVx superconducting films have been produced by DC magnetron sputtering at different growth temperatures. The phase formation and superconducting behavior of these films depend on the content of alloying x and deposition temperature. A single body-centered cubic (bcc) phase can be formed in the low x range with enough driving energy for crystallinity, but phase transition between amorphous or two bcc structures is observed when increasing x. The highest superconducting transition temperature Tc reaches 8.0 K for the TiZrNbTa film. The superconducting transition temperature Tc of these films deposited at the same temperature decreases monotonically as a function of x. Increasing deposition temperature to 400 °C can enhance Tc for these films while retaining nearly equivalent compositions. Our experimental observations suggest that Tc of superconducting high entropy alloys relate to the atomic radii difference and electronegativity difference of involved elements beyond the valence electron number.
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BCC-type HEA superconductors with VECs of 4.8 or more have been reported for (TiZrNbTa)1-xWx, Nb20Re20Zr20Hf20Ti20, NbTaTiZrFe, TiHfNbTaMo, and Ti-Hf-Nb-Ta-Re systems.
“BCC-type HEA superconductors with VECs of 4.8 or more have been reported for (TiZrNbTa)1x W x 30 , Nb20Re20Zr20Hf20Ti20 19 , NbTaTiZrFe 31 , TiHfNbTaMo 23 , and Ti-Hf-Nb-Ta-Re systems 25 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [30]
Increasing the deposition temperature to 400 °C can increase the Tc of (TaNbZrTi)1-xVx and (TaNbZrTi)1-xWx HEA films.
“Increasing the deposition temperature to 400 °C can increase the T c of the (TaNbZrTi)1x V x and (TaNbZrTi)1x W x HEA fi lms.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [30]
The Tc of HEA films is affected by the deposition temperature in the DC magnetron sputtering method.
“In addition to chemical doping, the T c of HEA fi lms is also affected by the deposition temperature in the DC magnetron sputtering method 30 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [30]
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Self-citation
- Authors
- Shu, R., Zhang, X., Rao, S. G., le Febvrier, A., & Eklund, P.
- Affiliations
- Linköping University (SE)
- Chinese Academy of Sciences (CN)
- Thin Film Physics Division, Department of Physics Chemistry, and Biology (IFM), Linköping University 1 , Linköping SE-581 83, Sweden
- Corresponding author
- Shu, Rui
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 2022-04-11
- Volume
- 120
- Issue
- 15
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W4223496837
- Cited by
- 20
- References
- 33
- Citations by year
- 2026: 1 · 2025: 6 · 2024: 7 · 2023: 5 · 2022: 1
- FWCI
- 1.79
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Applied Physics Letters (publishedVersion, cc-by)
- DiVA (Linkoping University) (submittedVersion, other-oa)
- KTH Publication Database DiVA (KTH Royal Institute of Technology) (submittedVersion, other-oa)
- Funders
- Swedish Goverment Strategic (SFO-Mat-LiU No. 2009 00971)
- VINNOVA (No. 2016-05156)
- Knut och Alice Wallenbergs Stiftelse (KAW-2020.0196)
- Swedish Research Council (No. 2021-03826)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › High Entropy Alloys Studies
- Physical Sciences › Engineering › Biomedical Engineering › Superconducting Materials and Applications
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Keywords
- high-entropy alloys, superconducting thin films, deposition temperature, alloying elements, superconducting transition temperature, phase formation, BCC phase, amorphous phase, tungsten substitution, vanadium substitution, atomic radius difference, electronegativity difference, DC magnetron sputtering
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