Cu NQR擦除效应与Zn/Ni掺杂NdBa $_{2}$ Cu $_{3}$ O $_{6+y}$中的电荷赝能隙
Cu NQR Wipeout Effect versus Charge Pseudogap in Zn/Ni Doped NdBa$_{2}$Cu$_{3}$O$_{6+y}$
摘要：
本文报道了用$^{63,65}$ Cu NQR方法测量了重掺Ni和Zn杂质的轻度欠掺杂NdBa $_{2}$ Cu $_{3}$ O $_{6+y}$单晶。由于杂质掺杂，在这两种情况下，超导性都被完全抑制。镍强烈增强磁相关性，并诱导wipeout的NQR信号相比，发现在条纹有序铜酸镧。相反，在Zn掺杂的样品中，磁性被抑制，其中没有观察到擦除效应，并且核自旋弛豫速率降低。我们的研究结果是在一个惊人的对应关系的不同影响的Ni和Zn杂质的电荷pseudogap证明最近的光学数据，从而揭示了磁相关性和pseudogap现象之间的密切关系。
英文摘要：
We report $^{63,65}$Cu NQR measurements on slightly underdoped NdBa$_{2}$Cu$_{3}$O$_{6+y}$ single crystals heavily doped by Ni and Zn impurities. Owing to the impurity doping superconductivity is fully suppressed in both cases. The Ni strongly enhances magnetic correlations and induces a wipeout of the NQR signal comparable to that found in stripe ordered lanthanum cuprates. In contrast, the magnetism is suppressed in the Zn doped sample where no wipeout effect is observed and the nuclear spin relaxation rate is reduced. Our findings are in a striking correspondence with the different impact of Ni and Zn impurities on the charge pseudogap evidenced by recent optical data, uncovering thereby a close relationship between the magnetic correlations and pseudogap phenomena.
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