Superconducting critical temperature and dimensionality tuning of RbV${}_3$Sb${}_5$ via biaxial strain

Abstract

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 $\epsilon =1.50\%$, 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${}_5$.

6 pages, 4 figures

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