Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates
Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates
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DOI：
10.1103/physrevb.90.220506
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发表时间：
2014-12-04
影响因子：
3.7
通讯作者：
Hill, J. P.
中科院分区：
文献类型：
--
作者：
Dean, M. P. M.;James, A. J. A.;Hill, J. P.
铜酸盐高温超导体表现出明显的趋势，其中超导转变温度Tc随着晶体结构中CuO 2平面的数目n而增加。我们利用Cu L-3边共振非弹性X射线散射比较了Bi 2 + xSr 2-xCuO 6 +delta（Bi-2201）和Bi（2）Sr（2）Ca（2）Cu 3 O（10+delta）（Bi-2223）（n = 1和3）的磁激发谱。在波腹区边界附近，Bi-2223的顺磁子能量显著高于Bi-2201，表明多层铜氧化物具有更强的有效磁交换作用，为T-c与n标度提供了可能的解释.相反，节点方向表现出非常强的阻尼，几乎非色散激励。我们认为，这意味着在掺杂铜酸盐的磁性是部分巡回性质。
The cuprate high temperature superconductors exhibit a pronounced trend in which the superconducting transition temperature T-c increases with the number of CuO2 planes n in the crystal structure. We compare the magnetic excitation spectrum of Bi2+xSr2-xCuO6+delta (Bi-2201) and Bi(2)Sr(2)Ca(2)Cu3O(10+delta) (Bi-2223), with n = 1 and 3, respectively, using Cu L-3-edge resonant inelastic x-ray scattering. Near the antinodal zone boundary we find the paramagnon energy in Bi-2223 is substantially higher than that in Bi-2201, indicating that multilayer cuprates host stronger effective magnetic exchange interactions, providing a possible explanation for the T-c vs n scaling. In contrast, the nodal direction exhibits very strongly damped, almost nondispersive excitations. We argue that this implies that the magnetism in the doped cuprates is partially itinerant in nature.