Dynamical Spin Susceptibility of Electron-Doped High-Tc Cuprates –Comparison with Hole-Doped Systems–
Dynamical Spin Susceptibility of Electron-Doped High-Tc Cuprates –Comparison with Hole-Doped Systems–
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DOI：
10.1143/jpsj.79.024708
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发表时间：
2010-02
影响因子：
1.7
通讯作者：
A. Suzuki;Syunsuke Tanaka;T. Mutou;D. Hirashima
中科院分区：
文献类型：
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作者：
A. Suzuki;Syunsuke Tanaka;T. Mutou;D. Hirashima
通过计算假定d x 2 - y 2 波超导序参数的二维哈伯德模型的动态自旋磁化率，研究了电子掺杂氧化铜超导体的磁激发谱。将电子掺杂系统的光谱与空穴掺杂系统的光谱进行比较，研究光谱中峰生长的频率与热点处超导能隙之间的关系。即使不完全满足磁共振条件，也可以观察到峰值。我们发现，在电子掺杂系统中，由于热点周围的态密度较小，因此与空穴掺杂系统相比，谐振条件不太可能得到满足，并且峰值频率接近热点处能隙幅度的两倍。
The magnetic excitation spectrum of electron-doped copper oxide superconductors is studied by calculating the dynamical spin susceptibility of the two-dimensional Hubbard model in which a d x 2 - y 2 -wave superconducting order parameter is assumed. The spectrum of electron-doped systems is compared with that of hole-doped systems, and the relationship between the frequency at which a peak grows in the spectrum and the superconducting energy gap at a hot spot is investigated. A peak may be observed even when the magnetic resonance condition is not exactly satisfied. We find that, in the electron-doped systems, the resonance condition is less likely to be satisfied than in the hole-doped systems because of the small density of states around the hot spots, and the peak frequency is close to twice the gap magnitude at the hot spots.