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$$mu$$SR study of impurity effects on the Cu-spin fluctuations in the overdoped regime of La$$_{2-x}$$Sr$$_x$$Cu$$_{1-y}$$Zn$$_y$$O$$_4$$

$$mu$$SR法によるLa$$_{2-x}$$Sr$$_x$$Cu$$_{1-y}$$Zn$$_y$$O$$_4$$のオーバードープ領域における銅スピン揺らぎに対する不純物効果の研究

Risdiana*; 足立 匡*; 沖 直樹*; 矢入 聡*; 田邊 洋一*; 大森 圭祐*; 鈴木 栄男*; 渡邊 功雄*; 幸田 章宏*; 髭本 亘  ; 小池 洋二*

Risdiana*; Adachi, Tadashi*; Oki, Naoki*; Yairi, Satoshi*; Tanabe, Yoichi*; Omori, Keisuke*; Suzuki, Takao*; Watanabe, Isao*; Koda, Akihiro*; Higemoto, Wataru; Koike, Yoji*

零磁場ミュオンスピン緩和測定によりLa$$_{2-x}$$Sr$$_x$$Cu$$_{1-y}$$Zn$$_y$$O$$_4$$(LSCO)の$$y$$=0-0.10, $$x$$=0.30までのオーバードープ領域において動的ストライプ構造が安定化されるかを調べた。その結果、Znドープによる銅スピン揺らぎの低下は$$x$$の増加に伴い減少し、$$x$$=0.30で消滅することがわかった。ここからストライプピニングモデルは全超伝導領域で成り立ち、また、$$x$$$$sim$$0.19近傍には量子臨界点は存在しないことが示唆される。

Zero-field muon-spin-relaxation measurements have been carried out for La$$_{2-x}$$Sr$$_x$$Cu$$_{1-y}$$Zn$$_y$$O$$_4$$ (LSCO)with $$y$$ = 0-0.10 in the overdoped regime up to $$x$$ = 0.30, in order to investigate whether the dynamical stripe correlations are pinned and stabilized even for the overdoped LSCO or not. It has been found that the Zn-induced slowing down of the Cu-spin fluctuations is weakened with increasing $$x$$ but takes place in the overdoped regime and disappears at $$x$$ = 0.30. This suggests that the stripe-pinning model holds good in the whole superconducting regime of LSCO and that there is no quantum critical point at $$x$$ $$sim$$ 0.19.

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パーセンタイル:17.34

分野:Physics, Applied

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