AI 中文总结
研究用脉冲激光沉积法制备Nd1-xEuxNiO2薄膜，发现其超导穹顶特性及场增强超导性，x= .3时Tc~31K，高于其他方法。磁输运测量有相关现象，低温霍尔电阻非线性，揭示磁性稀土Eu2+离子对镍酸盐奇异性质的关键作用。
AI 中文摘要
我们报道了采用脉冲激光沉积（PLD）制备无限层Nd1-xEuxNiO2（0<x<0.7）薄膜，随后用CaH2进行拓扑还原。对这些薄膜的电阻率测量显示，在0.2<x<0.5的掺杂范围内存在超导穹顶，其比分子束外延法制备的更宽，与化学合成法相当。x=0.3的PLD薄膜表现出最佳超导转变温度Tc~31K，高于其他真空外延技术制备的薄膜。磁输运测量揭示了欠掺杂和过掺杂区域中强大的场增强和再入超导性。低温下，霍尔电阻呈现非线性行为，可能源于磁性杂质散射。这些结果突出了磁性稀土Eu2+离子在产生无限层镍酸盐奇异物理性质中的关键作用。
英文摘要
We report on the synthesis of infinite-layer Nd1-xEuxNiO2 (0<x<0.7) thin films using pulsed laser deposition (PLD) followed by topotactic reduction with CaH2. Resistivity measurements on these films reveal a superconducting dome within the doping range 0.2<x<0.5, which is wider than that achieved by molecular beam epitaxy and comparable to that obtained by chemical synthesis. The x=0.3 PLD film exhibits the optimal superconducting transition temperature Tc~31 K, much higher than those grown by other vacuum epitaxial techniques. This result indicates that PLD is an ideal approach for fabricating high-quality, high-Tc Nd1-xEuxNiO2 superconducting films. Magneto-transport measurements reveal robust field-enhanced and re-entrant superconductivity in both underdoped and overdoped regimes. At low temperatures just above the onset Tc, the Hall resistance exhibits nonlinear behavior, which may originate from magnetic impurity scattering. These results highlight the crucial role of magnetic rare-earth Eu2+ ions in producing the exotic physical properties of the infinite-layer nickelates.
Comments10 pages, 5 figures
