AI 中文总结
研究铁电-超导相互作用，通过脉冲激光沉积制备YBCO/BTO异质结构，结合多种技术表征，发现异质结构超导转变温度降低，磁化率更低，确立其在可调谐氧化物电子学和可重构超导器件方面的潜力。
AI 中文摘要
微观理论预测，铁电体附近的超导层临界温度会被强烈改变，但缺乏实验证据。我们报道了用脉冲激光沉积在SrTiO3(001)衬底上生长的BaTiO3 (BTO)/YBa2Cu3O7-δ (YBCO)异质结构，精确控制生长条件和氧化学计量比。压电力显微镜证实了单层和异质结构薄膜中的铁电开关。中子反射测量显示埋入界面的低粗糙度参数，这对介导超导与铁电极化之间的界面耦合至关重要。单层YBCO的超导转变温度约为86K，而异质结构薄膜的转变温度分别约为75K和55K，整体磁化率也更低。这些发现凸显了结合多种技术来表征BTO/YBCO异质结构以及识别铁电-超导耦合细微特征的必要性，确立了BTO/YBCO异质结构在可调谐氧化物电子学和可重构超导器件方面的潜力。
英文摘要
Microscopic theories predict that the critical temperature of a superconducting layer can be strongly modified in proximity to a ferroelectric; however, experimental evidence is lacking. We report on BaTiO3 (BTO)/YBa2Cu3O7-δ (YBCO) heterostructures grown on SrTiO3 (001) substrates using pulsed laser deposition (PLD), with precise control of growth conditions and oxygen stoichiometry. Piezoresponse force microscopy confirms ferroelectric switching within both single-layer and heterostructured films. Neutron reflectometry measurements show low roughness parameters for the buried interfaces, which is critical for mediating the interfacial coupling between superconductivity and ferroelectric polarization. The superconducting transition temperature ($T_{\mathrm{C}}^{R}$) measured from the $R(T)$ curve of the single-layer YBCO was approximately 86 K, and a transition temperature ($T_{\mathrm{C}}^{M}$) of approximately 80-85 K was observed from the $M(T)$ curve. For the heterostructure film (YBCO/BTO/YBCO) grown under the same conditions, both resistivity and magnetization measurements indicate lower transition temperatures of approximately 75 K and approximately 55 K, respectively, as well as a lower overall susceptibility. These findings highlight the need to combine multiple techniques to characterize BTO/YBCO heterostructures and identify subtle features of the ferroelectric--superconducting coupling. This establishes BTO/YBCO heterostructures as promising systems for tunable oxide electronics and reconfigurable superconducting devices.
