Insight into high-entropy effect in body-centered cubic superconducting alloys
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866918350194475008 |
|---|---|
| author | Senga, Hanabusa Watanabe, Yuto Iwase, Fubuki Masuda, Ryo Kawahara, Daichi Haruyama, Toshiki Nishizaki, Terukazu Mizuguchi, Yoshikazu Kitagawa, Jiro |
| author_facet | Senga, Hanabusa Watanabe, Yuto Iwase, Fubuki Masuda, Ryo Kawahara, Daichi Haruyama, Toshiki Nishizaki, Terukazu Mizuguchi, Yoshikazu Kitagawa, Jiro |
| contents | We have characterized the superconducting critical temperature ($T_\mathrm{c}$), the Debye temperature ($θ_\mathrm{D}$), the electronic specific heat coefficient, and the Vickers microhardness of HfNbTiVZr, NbTiZr, HfNbTi, HfNbZr, and HfNbTa, all possessing a body-centered cubic (bcc) structure. By compiling a comparable dataset for other equiatomic quinary bcc high-entropy alloy (HEA) superconductors, we have examined the validity of the hypothesis regarding the high-entropy effect in bcc HEA superconductors, as proposed in our previous work. This hypothesis attributes the observed negative correlation between the electron-phonon coupling constant ($λ_\mathrm{e-p}$) and $θ_\mathrm{D}$ to a reduced phonon lifetime at higher $θ_\mathrm{D}$, arising from the uncertainty principle in highly disordered quinary alloys. However, a pronounced change in this negative correlation is not evident in equiatomic ternary alloys with a lower degree of atomic disorder, thereby providing limited support for the hypothesis. Alternatively, by assembling the full dataset of bcc alloys spanning binary through senary systems, we have identified a universal negative correlation between $λ_\mathrm{e-p}$ and $θ_{D}$. This result would be useful for the materials design of bcc superconducting alloys. We further propose that the Vickers microhardness offers an alternative means to evaluate $θ_{D}$ and may serve as a rapid screening metric for identifying bcc alloys with desired properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_19376 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Insight into high-entropy effect in body-centered cubic superconducting alloys Senga, Hanabusa Watanabe, Yuto Iwase, Fubuki Masuda, Ryo Kawahara, Daichi Haruyama, Toshiki Nishizaki, Terukazu Mizuguchi, Yoshikazu Kitagawa, Jiro Superconductivity We have characterized the superconducting critical temperature ($T_\mathrm{c}$), the Debye temperature ($θ_\mathrm{D}$), the electronic specific heat coefficient, and the Vickers microhardness of HfNbTiVZr, NbTiZr, HfNbTi, HfNbZr, and HfNbTa, all possessing a body-centered cubic (bcc) structure. By compiling a comparable dataset for other equiatomic quinary bcc high-entropy alloy (HEA) superconductors, we have examined the validity of the hypothesis regarding the high-entropy effect in bcc HEA superconductors, as proposed in our previous work. This hypothesis attributes the observed negative correlation between the electron-phonon coupling constant ($λ_\mathrm{e-p}$) and $θ_\mathrm{D}$ to a reduced phonon lifetime at higher $θ_\mathrm{D}$, arising from the uncertainty principle in highly disordered quinary alloys. However, a pronounced change in this negative correlation is not evident in equiatomic ternary alloys with a lower degree of atomic disorder, thereby providing limited support for the hypothesis. Alternatively, by assembling the full dataset of bcc alloys spanning binary through senary systems, we have identified a universal negative correlation between $λ_\mathrm{e-p}$ and $θ_{D}$. This result would be useful for the materials design of bcc superconducting alloys. We further propose that the Vickers microhardness offers an alternative means to evaluate $θ_{D}$ and may serve as a rapid screening metric for identifying bcc alloys with desired properties. |
| title | Insight into high-entropy effect in body-centered cubic superconducting alloys |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2602.19376 |