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arXiv 0801.2617cond-mat.supr-concond-mat.str-el
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La2-xSrxCu1-yZnyO4的赝能隙和掺杂对磁性的影响

The pseudogap and doping dependent magnetic properties of La2-xSrxCu1-yZnyO4

R. S. Islam, J. R. Cooper, J. W. Loram, S. H. Naqib

摘要:

研究了在较宽的Sr(x)和Zn(y)含量范围内,平面空穴含量p(= x)对La_(2-x)Sr_xCu_(1-y)Zn_yO_4多晶化合物静磁化率chi(T)的影响。由Zn引起的磁行为被发现强烈依赖于空穴含量。Zn诱导的表观磁矩在欠掺杂的La 2-xSrxCu 1-yZnyO 4中较大,在p ~ 0.19附近急剧下降,并且对于进一步的过掺杂没有太大变化。这是解释的锌感应磁行为的赝隙的效果,因为有越来越多的证据表明,赝隙消失相当突然p ~ 0.19 +/- 0.01。通过对chi(T)数据的详细分析,发现Zn诱导的磁贡献相当复杂,并且在很宽的温度范围内显示出非居里特征。观察到的行为进行了仔细检查的两种情况下(a)独立的本地化的时刻和(b)与每个Zn原子的低能准粒子共振。我们的研究指向后一种情况,更普遍地表明,有一个重新分配的准粒子光谱权重由于锌替代,其功能的赝隙的存在和大小的影响很大。

英文摘要:

The effects of planar hole content, p (= x), on the static magnetic susceptibility, chi(T), of polycrystalline La2-xSrxCu1-yZnyO4 compounds were investigated over a wide range of Sr (x) and Zn (y) contents. The magnetic behavior caused by Zn was found to depend strongly on the hole content. The apparent magnetic moment induced by Zn was larger in underdoped La2-xSrxCu1-yZnyO4, decreased quite sharply around p ~ 0.19, and did not change much for further overdoping. This is interpreted in terms of the effect of the pseudogap on the Zn-induced magnetic behavior, as there is growing evidence that the pseudogap vanishes quite abruptly at p ~ 0.19 +/- 0.01. From a detailed analysis of chi(T) data the Zn-induced magnetic contribution was found to be rather complex and showed non-Curie-like features over a wide range of temperature. The observed behavior was scrutinized in terms of two scenarios (a) that of independent localized-moments and (b) low energy quasiparticle resonances associated with each Zn atom. Our study points towards the latter scenario and more generally suggests that there is a re-distribution of quasiparticle spectral weight due to Zn substitution, the features of which are greatly influenced by the presence and magnitude of the pseudogap.

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