电子掺杂中低能自旋涨落的掺杂依赖性 铜酸盐PR$_{1-x}$蕾丝$_x$CuO$_4$

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摘要翻译：
研究了从反铁磁和非超导相到超导和顺磁相，在0.07$\leqslant$$x$$\leqslant$0.18的宽浓度范围内，电子掺杂Pr$＿1-x}$lace$＿x}$CuO$＿{4}$中的低能自旋涨落。对于所考虑的所有浓度，低能激发都显示出以($\pi$，$\pi$)位置为中心的相应峰。我们的数据表明，当系统进入超导相时，激发的特性，如弛豫速率和总谱权重发生了迅速的变化。在超导相中自旋刚度也随着$x$的增加而减小，当超导消失时，自旋刚度在$x$=0.21处外推为零。这表明自旋涨落与电子掺杂系统的超导电性密切相关。
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英文标题：
《Doping Dependence of Low-energy Spin Fluctuations in Electron-Doped
  Cuprates Pr$_{1-x}$LaCe$_x$CuO$_4$》
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作者：
M. Fujita, M. Matsuda, S.-H. Lee, M. Nakagawa, K. Yamada
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Strongly Correlated Electrons        强关联电子
分类描述：Quantum magnetism, non-Fermi liquids, spin liquids, quantum criticality, charge density waves, metal-insulator transitions
量子磁学，非费米液体，自旋液体，量子临界性，电荷密度波，金属-绝缘体跃迁
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
--

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英文摘要：
  The low-energy spin fluctuations in the electron-doped Pr$_{1-x}$LaCe$_{x}$CuO$_{4}$ have been investigated over a wide concentration range of 0.07$\leqslant$ $x$ $\leqslant$0.18 that spans from the antiferromagnetic and non-superconducting phase to the superconducting and paramagnetic phase. For all concentrations considered, the low energy excitations exhibit commensurate peaks centered at the ($\pi$, $\pi$) position. Our data show that the characteristics of the excitations, such as the relaxation rate and the overall spectral weight, change rapidly when the system enters the superconducting phase. The spin stiffness also decreases with increasing $x$ in the superconducting phase and is extrapolated to zero at $x$ = 0.21 when the superconductivity disappears. These indicate a close relation between the spin fluctuations and the superconductivity in the electron-doped system.
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PDF链接：
https://arxiv.org/pdf/707.015

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关键词：依赖性 Fluctuations Fluctuation Transitions Statistical phase 超导 CuO fluctuations