Direct relation between the low-energy spin excitations and superconductivity of overdoped high-Tc superconductors.
Direct relation between the low-energy spin excitations and superconductivity of overdoped high-Tc superconductors.
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DOI：
10.1103/physrevlett.92.217004
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发表时间：
2003-12
影响因子：
8.6
通讯作者：
S. Wakimoto;H. Zhang;K. Yamada;I. Swainson;Hyunkyung Kim;R. Birgeneau
中科院分区：
文献类型：
--
作者：
S. Wakimoto;H. Zhang;K. Yamada;I. Swainson;Hyunkyung Kim;R. Birgeneau
在2</=omega</=10 meV的能量范围内测量了过掺杂La_（2-x）Sr_xCuO_4的动态自旋磁化率。对于0.25</=x</=0.28的所有超导样品，在8 K下观察到无公度（IC）自旋激发，chi（“）峰值约为6 meV。随着x的增加，在6 meV处的IC峰的强度变得更小，并且最后，对于x=0.30的没有体超导性的样品变得不可观察。在过掺杂区，最大chi（“）随T（c）（起始）线性减小，表明自旋涨落与超导性之间存在直接的协同关系。
The dynamic spin susceptibility, chi(")(omega), has been measured over the energy range of 2</=omega</=10 meV for overdoped La2-xSrxCuO4. Incommensurate (IC) spin excitations are observed at 8 K for all superconducting samples for 0.25</=x</=0.28 with chi(") peaking at approximately 6 meV. The IC peaks at 6 meV become smaller in intensity with increasing x and, finally, become unobservable for a sample with x=0.30 which has no bulk superconductivity. The maximum chi(") decreases linearly with T(c)(onset) in the overdoped region, implying a direct cooperative relation between the spin fluctuations and the superconductivity.