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arXiv 1302.0576cond-mat.supr-concond-mat.str-el
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空穴掺杂铜氧化物中非磁性缺陷的效应:电子关联作用的探索

Effects of non-magnetic defects in hole doped cuprates: exploration of the roles of the underlying electronic correlations

S. H. Naqib, R. S. Islam

摘要:

本文研究了在较宽的空穴浓度、p和CuO_2面Zn含量(y)范围内,CuO_2面内的非磁性等价缺陷对YBa_2(Cu_(1-y)Zn_(1-y)Zn_(1-y))O_(7-d)(Zn-YBCO)和La_(2-x)Sr_xCu_(1-y)Zn_yO_4(Zn-LSCO)超导体的超导转变温度、Tc、直流电荷输运和体磁化率\c{hi}(T)的影响。通过对\c{hi}(T,y)数据的分析发现,在给定的p值下,赝能隙尺度εg几乎与缺陷含量无关。Zn引起的Tc抑制率dTc(p)/dy与p值有很强的相关性,并随空穴浓度有系统的变化,但在p ~ 0.125附近除外,即在所谓的1/8异常附近,其中电荷和自旋条纹排序在空穴掺杂的铜氧化物的各种族中最强。在p ~ 0.125附近,很大程度上认为静态条纹电荷有序在T-p电子相图中占主导地位。dTc(p)/dy在该组成附近强烈降低,即,当p ~ 0.125时,Zn在降解Tc方面突然变得不那么有效。这一观察结果,连同事实,即(i)锌抑制Tc最有效和(ii)的特征pseudogap能量标度仍然不敏感的Zn取代的水平,为我们提供了重要的线索的性质和相互作用的潜在的电子相关性存在于高Tc铜酸盐。基于上述结果,我们详细讨论了条纹有序、超导关联和赝能隙现象之间的可能联系。

英文摘要:

The effects of non-magnetic iso-valent defects inside the CuO2 plane(s) on superconducting transition temperature, Tc, dc charge transport, and the bulk magnetic susceptibility, \c{hi}(T), were investigated for the YBa2(Cu1-yZny)3O7-d (Zn-YBCO) and La2-xSrxCu1-yZnyO4 (Zn-LSCO) superconductors over a wide range of hole concentrations, p, and Zn contents (y) in the CuO2 plane(s). From the analysis of the \c{hi}(T, y) data, the pseudogap energy scale, εg, was found to be almost independent of the defect content at a given value of p. The Zn induced rate of suppression of Tc, dTc(p)/dy, was found to be strongly p-dependent and showed a systematic variation with hole concentration, except in the vicinity of p ~ 0.125, i.e., near the so-called 1/8th anomaly where the charge and spin stripe orderings are at their strongest in various families of hole doped cuprates. Near p ~ 0.125, the static striped charge ordering is largely believed to dominate the T-p electronic phase diagram. dTc(p)/dy decreased strongly around this composition, i.e., Zn abruptly became less effective in degrading Tc when p ~ 0.125. This observation, together with the facts that (i) Zn suppresses Tc most effectively and (ii) the characteristic pseudogap energy scale remains insensitive to the level of Zn substitution, provide us with important clues regarding the nature and interplay of the underlying electronic correlations present in high-Tc cuprates. We have discussed the possible connections among the stripe ordering, superconducting correlations and the pseudogap phenomenon in details in view of the above findings.

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