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arXiv 0901.0689cond-mat.supr-con
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铜氧化物中的自旋动力学:HgBa2CuO4的光电导

Spin Dynamics in Cuprates: Optical Conductivity of HgBa2CuO4

J. Yang, J. Hwang, E. Schachinger, J. P. Carbotte, R. P. S. M. Lobo, D. Colson, A. Forget, T. Timusk

摘要:

根据光散射率的新数据,计算了高温超导体HgBa 2CuO 4(Tc = 90 K)载流子散射的电子玻色子谱密度函数I^2 ChiOmega.使用最大熵技术。公布的数据HgBa_2Ca_2Cu_3O_8(Tc = 130 K)也被倒置,这些新的结果是在其他已知的情况下。所有的谱(有两个明显的例外)都在能量(Ω_r)与超导转变温度Ω_r ~= 6.3kB. Tc成正比的地方出现一个峰。这种电荷通道关系密切地遵循通过极化中子散射观察到的磁共振,Ω_r^{neutron} ~= 5.4 kB. Tc。两个峰的振幅随着温度的升高而强烈地减小。在某些情况下,Omega_r处的峰很弱,并且光谱可以具有额外的最大值和延伸到数百meV的背景。

英文摘要:

The electron-boson spectral density function I^2ChiOmega responsible for carrier scattering of the high temperature superconductor HgBa2CuO4 (Tc = 90 K) is calculated from new data on the optical scattering rate. A maximum entropy technique is used. Published data on HgBa2Ca2Cu3O8 (Tc = 130 K) are also inverted and these new results are put in the context of other known cases. All spectra (with two notable exceptions) show a peak at an energy (Omega_r) proportional to the superconducting transition temperature Omega_r ~= 6.3 kB.Tc. This charge channel relationship follows closely the magnetic resonance seen by polarized neutron scattering, Omega_r^{neutron} ~= 5.4 kB.Tc. The amplitudes of both peaks decrease strongly with increasing temperature. In some cases, the peak at Omega_r is weak and the spectrum can have additional maxima and a background extending up to several hundred meV.

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