Cu spin dynamics in the overdoped regime of La2?xSrxCu1?yZnyO4 probed by muon spin relaxation
Cu spin dynamics in the overdoped regime of La2?xSrxCu1?yZnyO4 probed by muon spin relaxation
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通过μ子自旋弛豫探测La2?xSrxCu1?yZnyO4过掺杂区域的Cu自旋动力学
DOI：
10.1103/physrevb.77.054516
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发表时间：
2007
影响因子：
3.7
通讯作者：
W. Higemoto
中科院分区：
文献类型：
--
作者：
Risdiana;Risdiana;Tadashi Adachi;N. Oki;S. Yairi;Y. Tanabe;K. Omori;Yoji Koike;Takao Suzuki;Isao Watanabe;A. Koda;W. Higemoto
对部分锌取代的${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}y}{\mathrm{Zn}}_{y}{\mathrm{O}}_{4}$的介子自旋弛豫进行了测量，结果表明，在高达0.30美元的过掺杂区，y=0char210.10$。在低至$x=0.27$的3%锌掺杂样品中，观察到指数形的介子自旋退极化，表明锌引起的铜自旋涨落变慢。退极化率随着$x的增加而减小，当$x=0.30$时，几乎没有观察到超导性消失的Muon自旋的快速退极化。目前的结果表明，在$x\ensureath{\sim}0.19$处不存在量子临界点。根据条纹钉扎模型和相分离模型对这些结果进行了讨论。
Muon-spin-relaxation measurements have been performed for partially Zn-substituted ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}y}{\mathrm{Zn}}_{y}{\mathrm{O}}_{4}$ with $y=0\char21{}0.10$ in the overdoped regime up to $x=0.30$. In the 3% Zn-substituted samples up to $x=0.27$, exponential-like depolarization of muon spins has been observed at low temperatures, indicating a Zn-induced slowing down of the Cu spin fluctuations. The depolarization rate decreases with increasing $x$, and almost no fast depolarization of muon spins has been observed for $x=0.30$ where superconductivity disappears. The present results suggest that there is no quantum critical point at $x\ensuremath{\sim}0.19$. These results are discussed in terms of the stripe-pinning model and the phase-separation model.
铜酸盐相图中的关键点
DOI：
--
发表时间：
2003
期刊：
Solid State Commun 126
影响因子：
--
作者：
N.Aso;N.K.Sato et al.;S.Uchida
通讯作者：
S.Uchida