Record-High T c and Dome-Shaped Superconductivity in a Medium-Entropy Alloy TaNbHfZr under Pressure up to 160 GPa
Abstract
Superconductivity has been one of the focal points in medium and high-entropy alloys (MEAs-HEAs) since the discovery of the body-centered cubic (bcc) HEA superconductor in 2014. Until now, the superconducting transition temperature (T_{c}) of most MEA and HEA superconductors has not exceeded 10 K. Here, we report a TaNbHfZr bulk MEA superconductor crystallized in the BCC structure with a T_{c} of 15.3 K which set a new record. During compression, T_{c} follows a dome-shaped curve. It reaches a broad maximum of roughly 15 K at around 70 GPa before decreasing to 9.3 K at 157.2 GPa. First-principles calculations attribute the dome-shaped curve to two competing effects, that is, the enhancement of the logarithmically averaged characteristic phonon frequency ω_{log} and the simultaneous suppression of the electron-phonon coupling constant λ. Thus, TaNbHfZr MEA may have a promising future for studying the underlying quantum physics, as well as developing new applications under extreme conditions.
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The phonon dispersion shows no imaginary frequencies up to 155 GPa, indicating the stability of the BCC-type phase in the TaNbHfZr superconductor under high pressure.
“Furthermore, the phonon dispersion shows no imaginary frequencies up to 155 GPa, indicating the stability of the BCC-type phase in the TaNbHfZr superconductor under high pressure.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [85]
Two competing effects are attributed to the dome-shaped curve in DFT calculations: the simultaneous suppression of the electron-phonon coupling constant λ and the enhancement of the logarithmically averaged characteristic phonon frequency ωlog.
“Two competing effects are attributed to the dome-shaped curve in DFT calculations: the simultaneous suppression of the electron -phonon coupling constant λ and the enhancement of the logarithmically averaged characteristic phonon frequency ω log .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [85]
The Tc of TaNbHfZr is 8.1 K at ambient pressure and achieves a broad maximum of approximately 15 K at 70 GPa before decreasing to 9.3 K at approximately 157 GPa.
“The T c is 8.1 K at ambient pressure and achieves a broad maximum of approximately 15 K at 70 GPa before decreasing to 9.3 K at approximately 157 GPa.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [85]
A new record Tc was observed in a BCC-type TaNbHfZr MEA superconductor under pressure.
“Recently, a new record T c was observed in a BCC-type TaNbHfZr MEA superconductor under pressure 85 .”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [85]
Under pressure, Tc exhibits a dome-shaped curve in the phase diagram for TaNbHfZr, which is different from that of (NbTa)0.67(TiZrHf)0.33 HEA and high-entropy carbides.
“Under pressure, T c exhibits a dome-shaped curve in the phase diagram, which is different from that of (NbTa)0.67(TiZrHf)0.33 HEA and high-entropy carbides.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [85]
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References 63 · Cited by 28
- Authors
- Wu, L., Si, J., Guan, S., Zhang, H., Dou, J., Luo, J., Yang, J., Yu, H., Zhang, J., Ma, X., Yang, P., Zhou, R., Liu, M., Hong, F., & Yu, X.
- Affiliations
- Chinese Academy of Sciences (CN)
- Beijing Information Science & Technology University (CN)
- Corresponding author
- Hong, Fang
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2024-04-16
- Volume
- 132
- Issue
- 16
- Pages
- 166002-166002
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W4394844609
- Cited by
- 28
- References
- 63
- Citations by year
- 2026: 6 · 2025: 18 · 2024: 4
- FWCI
- 3.76
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Key Research and Development Program of China (2021YFA1400300, 2021YFA0718700, 023YFA1608901, 2022YFA1403402)
- National Natural Science Foundation of China (12374050, 12304095, 12375304, 11974405)
- Beijing Synchrotron Radiation Facility
- Chinese Academy of Sciences (KJCX2-SW-N20, KJCX2-SW-N03)
- Strategic Priority Research Program of the Chinese Academy of Sciences (CAS-WX2023SF-0101)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › High Entropy Alloys Studies
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Keywords
- medium-entropy alloys, high-entropy alloys, superconductivity, superconducting transition temperature, high pressure, bcc structure, electron-phonon coupling, phonon frequencies, first-principles calculations, extreme conditions
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