Effect of magnetic impurities on superconductivity and spin correlation of La2-xSrxCuO4
Effect of magnetic impurities on superconductivity and spin correlation of La2-xSrxCuO4
复制标题
磁性杂质对La2-xSrxCuO4超导性和自旋相关性的影响
DOI：
10.1016/s0921-4534(03)00859-1
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发表时间：
2003
影响因子：
1.7
通讯作者：
K. Yamada
中科院分区：
文献类型：
--
作者：
T. Churei;H. Hiraka;Y. Endoh;M. Matsuda;K. Yamada
为了系统地研究磁性杂质的影响，用La2−xSrxCu0.97Ni0.0 3O4(x介于0.1 0~0.2 0)的浓度梯度单晶研究了超导相图。当x=0.12时，无杂质体系中Tc的反常抑制现象在3%Ni取代时消失，块体超导电性急剧降低，Tc低于x∼0.12。与非磁性的锌取代相比，2%Ni取代的La1.85Sr0.15Cu0.98Ni0.02O4(Tc=28K)中没有观察到静态自旋关联。另一方面，精确定义的无公度磁峰出现在ω=0.4meV以下。由非弹性峰宽估算的关联长度为∼50A，与1.2%锌取代的La1.86Sr0.14Cu0.988 Zn 0.012 O4(∼70A)的关联长度相当。
In order to investigate the effect of magnetic impurities systematically, the superconducting phase diagram is investigated by using a concentration-graded single crystal of La 2− x Sr x Cu 0.97 Ni 0.03 O 4 with x between 0.10 and 0.20. The anomalous suppression of T c seen in the impurity-free system at around x= 0.12, disappears upon 3% Ni-substitution and the bulk superconductivity is drastically depressed as well as T c below x∼ 0.12. In contrast to non-magnetic Zn-substitution no static spin correlation is observable in the 2% Ni-substituted La 1.85 Sr 0.15 Cu 0.98 Ni 0.02 O 4 (T c= 28 K). On the other hand, well-defined incommensurate magnetic peaks appear down to ω= 0.4 meV. The correlation length evaluated from the inelastic peak-width is∼ 50 A, which is comparable to that of 1.2% Zn-substituted La 1.86 Sr 0.14 Cu 0.988 Zn 0.012 O 4 (∼ 70 A).
影响因子：
8.6
作者：
Fujita, M;Goka, H;Matsuda, M
通讯作者：
Matsuda, M