Cu spin dynamics in the overdoped regime of La_(2-x)Sr_xCu_(1-y)Zn_yO_4 probed by muon spin relaxation

T. Adachi; N. Oki; S. YairiY. TanabeK. OmoriY. KoikeT. SuzukiI. WatanabeA. KodaW. Higemoto

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Cu spin dynamics in the overdoped regime of La_(2-x)Sr_xCu_(1-y)Zn_yO_4 probed by muon spin relaxation

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Muon-spin-relaxation measurements have been performed for partially Zn-substituted La_(2-x)Sr_xCu_(1-y)Zn_yO_4 with y=0-0.10 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～0.19. These results are discussed in terms of the stripe-pinning model and the phase-separation model.

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《Physical review, B. Condensed matter and materials physics》 |2008年第5期|054516.1-054516.6|共9页
作者
T. Adachi; N. Oki; S. YairiY. TanabeK. OmoriY. KoikeT. SuzukiI. WatanabeA. KodaW. Higemoto;
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作者单位

Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;

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正文语种英语
中图分类固体物理学;
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effects of crystal defects; doping and substitution; La-based cuprates; muon spin rotation and relaxation; magnetic properties;

Cu spin dynamics in the overdoped regime of La_(2-x)Sr_xCu_(1-y)Zn_yO_4 probed by muon spin relaxation

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