Chan M K, Dorow C J, Mangin-Thro L, Tang Y, Ge Y, Veit M J, Yu G, Zhao X, Christianson A D, Park J T, Sidis Y, Steffens P, Abernathy D L, Bourges P, Greven M
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Pulsed Field Facility, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Nat Commun. 2016 Mar 4;7:10819. doi: 10.1038/ncomms10819.
Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and the pseudogap phenomena exhibited by the cuprates. Although the antiferromagnetic response in the pseudogap state has been reported for a number of compounds, there exists no information for structurally simple HgBa2CuO(4+δ). Here we report neutron-scattering results for HgBa2CuO(4+δ) (superconducting transition temperature Tc≈71 K, pseudogap temperature T*≈305 K) that demonstrate the absence of the two most prominent features of the magnetic excitation spectrum of the cuprates: the X-shaped 'hourglass' response and the resonance mode in the superconducting state. Instead, the response is Y-shaped, gapped and significantly enhanced below T*, and hence a prominent signature of the pseudogap state.
反铁磁关联被认为是铜酸盐所表现出的d波超导性和赝能隙现象的原因。尽管已经报道了许多化合物在赝能隙状态下的反铁磁响应，但对于结构简单的HgBa2CuO(4+δ)却没有相关信息。在此，我们报告了HgBa2CuO(4+δ)（超导转变温度Tc≈71K，赝能隙温度T*≈305K）的中子散射结果，这些结果表明铜酸盐磁激发谱中两个最显著的特征不存在：X形的“沙漏”响应和超导态下的共振模式。相反，其响应是Y形的，有能隙，并且在T*以下显著增强，因此是赝能隙状态的一个显著特征。
