Nature of the spin resonance mode in CeCoIn(5).

Nature of the spin resonance mode in CeCoIn(5).
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CeCoIn中的自旋共振模式的性质(5)。

DOI:
10.1038/s42005-020-0365-8
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发表时间:
2020
影响因子:
5.5
通讯作者:
Dai P
Dai P
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Song Y;Wang W;Van Dyke JS;Pouse N;Ran S;Yazici D;Schneidewind A;Čermák P;Qiu Y;Maple MB;Morr DK;Dai P

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自旋涨落介导的非常规超导性可以出现在磁性的边界,其特征是超导序参量在动量空间中改变符号。这种符号变化的检测在实验上具有挑战性,因为大多数探针不是相位敏感的。中子非弹性散射的自旋共振模(SRM)的观测通常被看作是超导序参量变号的强相敏证据,假设SRM是自旋激子束缚态。在这里,我们表明,对于重费米子超导体CeCoIn 5,它的SRM无视自旋激子束缚态的预期,并且不是变号超导性的表现。相反,在CeCoIn 5中的SRM可能是由于超导状态中的磁振子样模式的阻尼减少而产生的,这是由于其接近磁量子临界。我们的研究结果强调,需要更严格的测试是否SRM是自旋激子,当使用它们的存在来证明符号变化的超导性。
Spin-fluctuation-mediated unconventional superconductivity can emerge at the border of magnetism, featuring a superconducting order parameter that changes sign in momentum space. Detection of such a sign-change is experimentally challenging, since most probes are not phase-sensitive. The observation of a spin resonance mode (SRM) from inelastic neutron scattering is often seen as strong phase-sensitive evidence for a sign-changing superconducting order parameter, by assuming the SRM is a spin-excitonic bound state. Here we show that for the heavy fermion superconductor CeCoIn5, its SRM defies expectations for a spin-excitonic bound state, and is not a manifestation of sign-changing superconductivity. Instead, the SRM in CeCoIn5 likely arises from a reduction of damping to a magnon-like mode in the superconducting state, due to its proximity to magnetic quantum criticality. Our findings emphasize the need for more stringent tests of whether SRMs are spin-excitonic, when using their presence to evidence sign-changing superconductivity.
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