Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce(1-x)Yb(x)CoIn(5).
Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce(1-x)Yb(x)CoIn(5).
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重费米子超导体 Ce1-xYbxCoIn5 中中子自旋共振的鲁棒向上色散
DOI：
10.1038/ncomms12774
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发表时间：
2016-09-28
影响因子：
16.6
通讯作者：
Dai, Pengcheng
中科院分区：
文献类型：
--
作者：
Song, Yu;Van Dyke, John;Lum, I. K.;White, B. D.;Jang, Sooyoung;Yazici, Duygu;Shu, L.;Schneidewind, A.;Cermak, Petr;Qiu, Y.;Maple, M. B.;Morr, Dirk K.;Dai, Pengcheng
中子自旋共振是一种集体磁激发，出现在非常规的铜氧化物、铁磷属元素化物和重费米子超导体中。虽然由于超导序参量的d（s±）波对称性，共振通常与自旋激子相关联，但也有人提出它是超导态中出现的类磁振子激发。在这里，我们使用非弹性中子散射来证明重费米子超导体Ce 1 − xYbxCoIn 5（x=0，0.05和0.3）中的共振具有环状向上色散，这种色散对Yb掺杂具有鲁棒性。通过比较我们的实验数据与随机相位近似计算使用的电子结构和动量依赖性的波超导间隙确定从扫描隧道显微镜（STM）CeCoIn 5，我们得出结论，强大的向上色散的共振模式Ce 1-xYbxCoIn 5是不一致的自旋激子的情况下预测的向下色散。 非常规超导体中集体磁激发的机制仍然存在争议。在这里，Song等人展示了重费米子超导体Ce 1-xYbxCoIn 5中的中子自旋共振，这意味着类似于磁振子的激发，而不是自旋激子类型。
The neutron spin resonance is a collective magnetic excitation that appears in the unconventional copper oxide, iron pnictide and heavy fermion superconductors. Although the resonance is commonly associated with a spin-exciton due to the d(s±)-wave symmetry of the superconducting order parameter, it has also been proposed to be a magnon-like excitation appearing in the superconducting state. Here we use inelastic neutron scattering to demonstrate that the resonance in the heavy fermion superconductor Ce1−xYbxCoIn5 with x=0, 0.05 and 0.3 has a ring-like upward dispersion that is robust against Yb-doping. By comparing our experimental data with a random phase approximation calculation using the electronic structure and the momentum dependence of the -wave superconducting gap determined from scanning tunnelling microscopy (STM) for CeCoIn5, we conclude that the robust upward-dispersing resonance mode in Ce1−xYbxCoIn5 is inconsistent with the downward dispersion predicted within the spin-exciton scenario. The mechanism of collective magnetic excitations in unconventional superconductors remains controversial. Here, Song et al. show neutron spin resonance in a heavy fermion superconductor Ce1-xYbxCoIn5, implying magnon-like excitation rather than spin-exciton type.
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