Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa2CuO(4+δ).
Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa2CuO(4+δ).
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DOI：
10.1038/ncomms10819
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发表时间：
2016-03-04
影响因子：
16.6
通讯作者：
Greven M
中科院分区：
文献类型：
--
作者：
Chan MK;Dorow CJ;Mangin-Thro L;Tang Y;Ge Y;Veit MJ;Yu G;Zhao X;Christianson AD;Park JT;Sidis Y;Steffens P;Abernathy DL;Bourges P;Greven M
反铁磁关联被认为是d波超导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态下的反铁磁响应，但对于结构简单的HgBa 2CuO 4 +δ却没有任何信息。在这里，我们报告的HgBa 2CuO 4 +δ（超导转变温度Tc <$71 K，赝能隙温度T*<$305 K）的中子散射结果表明，没有两个最突出的特点的磁激发谱的铜酸盐：X形的“沙漏”响应和共振模式的超导状态。相反，响应是Y形的，有间隙的，并且在T* 以下显著增强，因此是伪间隙状态的突出特征。 在铜氧化物中，反铁磁关联可能是赝能隙现象的原因。在这里，作者使用中子散射的tetraphenocuprate HgBa 2CuO 4 +δ揭示相称的反铁磁激发作为赝能隙状态的签名。
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 HgBa2CuO4+δ. Here we report neutron-scattering results for HgBa2CuO4+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. In the cuprates, antiferromagnetic correlations might be the cause of the pseudogap phenomenon. Here the authors use neutron scattering on the tetragonal cuprate HgBa2CuO4+δ revealing commensurate antiferromagnetic excitations as a signature of the pseudogap state.