论文标题
紧张的无限层镍Prnio2中的磁激发
Magnetic Excitations in Strained Infinite-layer Nickelate PrNiO2
论文作者
论文摘要
密切相关的材料通常对外部扰动敏感。在最近发现的超导无限层镍盐中，可以仅通过基板设计实现〜1％的压缩应变调节，可以大大增强超导过渡温度。但是，这种增强的根源仍然难以捉摸。虽然超导配对机构仍未解决，但磁性库珀配对 - 与丘比特相似。使用谐振非弹性X射线散射，我们研究了用于不同应变条件的无限层PRNIO2薄膜中的磁激发。 PRNIO2的镁带宽仅显示对应变调节的边际响应，与掺杂的超导样品中超导过渡温度TC的显着增强形成鲜明对比。这些结果表明，TC的增强不是由自旋激发介导的，因此为理解无限层镍的超导性提供了重要的经验。
Strongly correlated materials often respond sensitively to the external perturbations. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be dramatically enhanced via only ~1% compressive strain-tuning enabled by substrate design. However, the root of such enhancement remains elusive. While the superconducting pairing mechanism is still not settled, magnetic Cooper pairing - similar to the cuprates has been proposed. Using resonant inelastic x-ray scattering, we investigate the magnetic excitations in infinite-layer PrNiO2 thin films for different strain conditions. The magnon bandwidth of PrNiO2 shows only marginal response to strain-tuning, in sharp contrast to the striking enhancement of the superconducting transition temperature Tc in the doped superconducting samples. These results suggest the enhancement of Tc is not mediated by spin excitations and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates.
