Modification of magnetic fluctuations by interfacial interactions in artificially engineered heavy-fermion superlattices
Modification of magnetic fluctuations by interfacial interactions in artificially engineered heavy-fermion superlattices
复制标题
通过人工设计的重费米子超晶格中的界面相互作用来改变磁涨落
DOI：
10.1103/physrevb.99.081115
复制
发表时间：
2019
影响因子：
3.7
通讯作者：
Ishida Kenji
中科院分区：
文献类型：
--
作者：
Nakamine Genki;Yamanaka Takayoshi;Kitagawa Shunsaku;Naritsuka Masahiro;Ishii Tomohiro;Shibauchi Takasada;Terashima Takahito;Kasahara Yuichi;Matsuda Yuji;Ishida Kenji
超晶格制备技术的最新进展使得在常规金属层或自旋密度波金属层之间夹入多层厚的重费米子超导块层成为可能。然而，在每个BL的磁状态，特别是在界面处，尚未被理解，适用于SL系统的实验技术是有限的。在这里，我们报告测量核磁共振，这是一个微观探针的磁特性内的目标BL。在SL中，由于Rashba自旋轨道效应，BL的低温磁涨落减弱。然而，在SL中，波动在低于6 K时显示出异常增强，突出了在BL的磁有序温度K附近发生的磁邻近效应的重要性。我们认为，可以通过界面相互作用改变的BL的磁性，这是一个替代的路线来修改的磁性。
Recent progress in the fabrication techniques of superlattices (SLs) has made it possible to sandwich several-layer-thick block layers (BLs) of heavy-fermion superconductorbetween conventional-metalBLs or spin-density-wave-metalBLs of a similar thickness. However, the magnetic state in each BL, particularly at the interface, is not yet understood, as experimental techniques applicable to the SL system are limited. Here, we report measurements ofnuclear magnetic resonance, which is a microscopic probe of the magnetic properties inside the target BLs. In theSL, the low-temperature magnetic fluctuations of theBL are weakened as expected from the Rashba spin-orbit effect. However, in theSL, the fluctuations show an anomalous enhancement below 6 K, highlighting the importance of the magnetic proximity effect occurring near a magnetic-ordering temperatureK of theBL. We suggest that the magnetic properties of the BLs can be altered by the interfacial interaction, which is an alternative route to modify the magnetic properties.