论文标题
使用谐振非弹性X射线散射在孔掺杂的灯笼和鞭毛铜质超导体中检测声学等离子体
Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering
论文作者
论文摘要
高TC超导体显示出与电荷自由度相关的各种阶段。价电荷可能会导致这些分层的丘比特超导体中的充电订单或声学等离子体。虽然已经观察到孔和电子掺杂的铜矿的电荷顺序，但仅在电子掺杂材料中发现了声学等离子体。在这里，我们使用共振的非弹性X射线散射（RIX）来观察两个孔掺杂的蛋白酸酯蛋白蛋白酶超导体[LA2-XSRXCUO4（LSCO）（LSCO）和BI2SR1.6LA0.6LA0.4CUO6+D（BI2201）]，CRUCAILION图片。有趣的是，与在Cu和O位置都表现出的准静态式订购相反，观察到的声学等离子体主要与O位点相关，从而揭示了孔掺杂的库酸盐中价电荷行为的独特二分法。
High Tc superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in these layered cuprate superconductors. While charge ordering has been observed for both hole- and electron-doped cuprates, acoustic plasmons have only been found in electron-doped materials. Here, we use resonant inelastic X-ray scattering (RIXS) to observe the presence of acoustic plasmons in two families of hole-doped cuprate superconductors [La2-xSrxCuO4 (LSCO) and Bi2Sr1.6La0.4CuO6+d (Bi2201)], crucially completing the picture. Interestingly, in contrast to the quasi-static charge ordering which manifests at both Cu and O sites, the observed acoustic plasmons are predominantly associated with the O sites, revealing a unique dichotomy in the behaviour of valence charges in hole-doped cuprates.
