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arXiv 0707.0150cond-mat.str-elcond-mat.stat-mech
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电子掺杂铜氧化物Pr $_{1-x}$ LaCe $_x$ CuO $_4$中低能自旋涨落的掺杂效应

Doping Dependence of Low-energy Spin Fluctuations in Electron-Doped Cuprates Pr$_{1-x}$LaCe$_x$CuO$_4$

M. Fujita, M. Matsuda, S. -H. Lee, M. Nakagawa, K. Yamada

摘要:

研究了电子掺杂Pr $_{1-x}$ LaCe $_{x}$ CuO $_{4}$在0.07 $\leqslant$ $x$ $\leqslant$ 0.18的宽浓度范围内的低能自旋涨落,该浓度范围从反铁磁和非超导相跨越到超导和顺磁相.对于所有考虑的浓度,低能量激发表现出相称的峰值集中在($π$,$π$)的位置。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,迅速变化。自旋刚度也随着$x$的增加而减小,并且当超导性消失时,自旋刚度在$x$ = 0.21处外推到零。这表明电子掺杂体系中自旋涨落与超导电性之间存在着密切的关系。

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$0.18 that spans from the antiferromagnetic and non-superconducting phase to the superconducting and paramagnetic phase. For all concentrations considered, the low energy excitations exhibit commensurate peaks centered at the ($π$, $π$) 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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