Unconventional quantum states, most notably the two-dimensional (2D) superconductivity, have been realized at the interfaces of oxide heterostructures where they can be effectively tuned by the gate voltage (V_G). Here we report that the interface between high-quality EuO (111) thin film and KTaO₃ (KTO) (110) substrate shows superconductivity with onset transition temperature \(T_{{{\mathrm{c}}}}^{{{{\mathrm{onset}}}}}\) = 1.35 K. The 2D nature of superconductivity is verified by the large anisotropy of the upper critical field and the characteristics of a Berezinskii–Kosterlitz-Thouless transition. By applying V_G, \(T_{{{\mathrm{c}}}}^{{{{\mathrm{onset}}}}}\) can be tuned from ~1 to 1.7 K; such an enhancement can be possibly associated with a boosted spin-orbit energy \(\varepsilon _{{{{\mathrm{so}}}}} = \hbar /\tau _{{{{\mathrm{so}}}}}\), where τ_so is the spin-orbit relaxation time. Further analysis of τ_so based on the upper critical field (H_c2) and magnetoconductance reveals complex nature of spin-orbit coupling (SOC) at the EuO/KTO(110) interface with different mechanisms dominating the influence of SOC effects on the superconductivity and the magnetotransport in the normal state. Our results demonstrate that the SOC should be considered an important factor in determining the 2D superconductivity at oxide interfaces.

非常规量子态，尤其是二维 (2D) 超导性，已经在氧化物异质结构的界面上实现，它们可以通过栅极电压 ( V _G ) 进行有效调谐。在这里，我们报告了高质量 EuO (111) 薄膜和 KTaO ₃ (KTO) (110) 衬底之间的界面显示出超导性和起始转变温度\(T_{{{\mathrm{c}}}}^{{{ {\mathrm{onset}}}}}\)  = 1.35 K。超导的二维性质通过上临界场的大各向异性和 Berezinskii-Kosterlitz-Thouless 跃迁的特征得到验证。通过应用V _G，\(T_{{{\mathrm{c}}}}^{{{{\mathrm{onset}}}}}\)可以从 ~1 调整到 1.7 K；这种增强可能与增强的自旋轨道能量\(\varepsilon _{{{{\mathrm{so}}}}} = \hbar /\tau _{{{{\mathrm{so}}} }}\)，其中τ _so是自旋轨道弛豫时间。基于上临界场 ( H _{c2 ) 和磁导率对}τ _so的进一步分析揭示了 EuO/KTO(110) 界面处自旋轨道耦合 (SOC) 的复杂性质，其中不同的机制主导着 SOC 效应对超导性和正常状态下的磁输运。我们的结果表明，SOC 应被视为确定氧化物界面处二维超导性的重要因素。