Superconducting critical temperature and dimensionality tuning of RbV$_3$Sb$_5$ via biaxial strain
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918064329588736 |
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| author | Poon, Tsz Fung Yip, King Yau Tsui, Ying Kit Wang, Lingfei Yu, Kai Ham Zhang, Wei Wang, Zheyu Nakatani, Taketo Michioka, Chishiro Ueda, Hiroaki Lam, Siu Tung Lai, Kwing To Goh, Swee K. |
| author_facet | Poon, Tsz Fung Yip, King Yau Tsui, Ying Kit Wang, Lingfei Yu, Kai Ham Zhang, Wei Wang, Zheyu Nakatani, Taketo Michioka, Chishiro Ueda, Hiroaki Lam, Siu Tung Lai, Kwing To Goh, Swee K. |
| contents | Kagome metal AV$_3$Sb$_5$ (A=K, Rb, Cs) has emerged as an intriguing platform for exploring the interplay between superconductivity and other quantum states. Among the three compounds, RbV$_3$Sb$_5$ has a notably lower superconducting critical temperature ($T_c$) at ambient pressure, posing challenges in exploring the superconducting state. For instance, the upper critical field ($H_{c2}$) is small and thus difficult to measure accurately against other control parameters. Hence, enhancing superconductivity would facilitate $H_{c2}$ measurements, providing insights into key superconducting properties such as the dimensionality. In this letter, we report the tuning of the $T_c$ in RbV$_3$Sb$_5$ through the application of biaxial strain. Utilizing a negative thermal expansion material ZrW$_2$O$_8$ as a substrate, we achieve a substantial biaxial strain of $ε=1.50\%$, resulting in a remarkable 75\% enhancement in $T_c$. We investigate the $H_{c2}$ as a function of temperature, revealing a transition from multi-band to single-band superconductivity with increasing tensile strain. Additionally, we study the $H_{c2}$ as a function of field angle, revealing a plausible correlation between the $T_c$ enhancement and the change in dimensionality of the superconductivity under tensile strain. Further analysis quantitatively illustrates a transition towards two-dimensional superconductivity in RbV$_3$Sb$_5$ when subjected to tensile strain. Our work demonstrates that the application of biaxial strain allows for the tuning of both the $T_c$ and superconducting dimensionality in RbV$_3$Sb$_5$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_16165 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconducting critical temperature and dimensionality tuning of RbV$_3$Sb$_5$ via biaxial strain Poon, Tsz Fung Yip, King Yau Tsui, Ying Kit Wang, Lingfei Yu, Kai Ham Zhang, Wei Wang, Zheyu Nakatani, Taketo Michioka, Chishiro Ueda, Hiroaki Lam, Siu Tung Lai, Kwing To Goh, Swee K. Superconductivity Materials Science Kagome metal AV$_3$Sb$_5$ (A=K, Rb, Cs) has emerged as an intriguing platform for exploring the interplay between superconductivity and other quantum states. Among the three compounds, RbV$_3$Sb$_5$ has a notably lower superconducting critical temperature ($T_c$) at ambient pressure, posing challenges in exploring the superconducting state. For instance, the upper critical field ($H_{c2}$) is small and thus difficult to measure accurately against other control parameters. Hence, enhancing superconductivity would facilitate $H_{c2}$ measurements, providing insights into key superconducting properties such as the dimensionality. In this letter, we report the tuning of the $T_c$ in RbV$_3$Sb$_5$ through the application of biaxial strain. Utilizing a negative thermal expansion material ZrW$_2$O$_8$ as a substrate, we achieve a substantial biaxial strain of $ε=1.50\%$, resulting in a remarkable 75\% enhancement in $T_c$. We investigate the $H_{c2}$ as a function of temperature, revealing a transition from multi-band to single-band superconductivity with increasing tensile strain. Additionally, we study the $H_{c2}$ as a function of field angle, revealing a plausible correlation between the $T_c$ enhancement and the change in dimensionality of the superconductivity under tensile strain. Further analysis quantitatively illustrates a transition towards two-dimensional superconductivity in RbV$_3$Sb$_5$ when subjected to tensile strain. Our work demonstrates that the application of biaxial strain allows for the tuning of both the $T_c$ and superconducting dimensionality in RbV$_3$Sb$_5$. |
| title | Superconducting critical temperature and dimensionality tuning of RbV$_3$Sb$_5$ via biaxial strain |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2506.16165 |