Absence of edge localized moments in the doped spin-Peierls system CuGe1-xSixO3.
Absence of edge localized moments in the doped spin-Peierls system CuGe1-xSixO3.
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掺杂自旋 Peierls 系统 CuGe1-xSixO3 中不存在边缘局域矩。
DOI：
10.1103/physrevlett.88.037603
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发表时间：
2001
影响因子：
8.6
通讯作者：
Y. Ueda
中科院分区：
文献类型：
--
作者：
J. Kikuchi;T. Matsuoka;K. Motoya;T. Yamauchi;Y. Ueda
本文报道了在CuGe_（1-x）SixO_3体系中，从掺杂中心附近的原子核四极共振（NQR）谱中观察到的Cu原子核四极共振谱。该信号在Cu NQR谱中表现为卫星，并且具有抑制的核自旋-晶格弛豫速率，这表明掺杂中心附近的单重态相关而不是增强的磁相关。还观察到没有相邻Si的Cu核的信号损失。我们得出结论，从这些观察，掺杂引起的时刻是不是在附近的掺杂中心，而是远离它。
We report the observation of nuclear quadrupole resonance (NQR) of Cu from the sites near the doping center in the spin-Peierls system CuGe 1-xSixO3. The signal appears as the satellites in the Cu NQR spectrum, and has a suppressed nuclear spin-lattice relaxation rate indicative of a singlet correlation rather than an enhanced magnetic correlation near the doping center. Signal loss of Cu nuclei with no neighboring Si is also observed. We conclude from these observations that the doping-induced moments are not in the vicinity of the doping center but rather away from it.