Looking for (½, ½ ,L) magnetic diffraction peaks in infinite-layer nickelates

Recently, the discovery of superconductivity in infinite-layer nickelate thin films has generated a great excitement, as their properties are believed to be related to the NiO2 plane, which are considered to be equivalent to the CuO2 planes in cuprate high-Tc superconductors (HTS). Recently it has been shown that infinite layer nickelates exhibit peculiar magnetic excitations with a bandwidth of circa 200 meV in SrTiO3- capped infinite-layer nickelate thin films. The magnetic mode is softening upon Sr-doping. During a previous high-resolution RIXS experiment at ID32 beam-line of ESRF [proposal HC-4628] we could reproduce such a result on our SrTiO3-capped samples. Here we would like to ascertain if such spin excitations are giving rise to a long-range magnetic order and, understand, the possible connection with the superconducting state.

近期，无限层镍酸盐薄膜中超导性（superconductivity）的发现引发了极大关注，因其性质被认为与NiO₂平面相关——该平面被视作与铜氧化物高温超导体（HTS）中的CuO₂平面等效。近期研究表明，在钛酸锶（SrTiO₃）覆盖的无限层镍酸盐薄膜中，无限层镍酸盐呈现出独特的磁激发，其带宽约为200毫电子伏特（meV）。锶掺杂会导致该磁模式软化。在欧洲同步辐射装置（ESRF）ID32光束线开展的前期高分辨率共振非弹性X射线散射（RIXS）实验中[提案编号HC-4628]，我们成功在钛酸锶覆盖的样品上复现了这一结果。本研究旨在明确此类自旋激发（spin excitations）是否会引发长程磁有序，并探究其与超导态之间的潜在关联。