在最近的工作[M。Jiang,M.,中国古猿科昆虫Moeller,M. Berciu和G. A. Sawatzky,Phys. Rev. B \textbf{101},035151(2020)]中,作者求解了在O-2 p带中具有Cu杂质的模型,作为空穴掺杂的铜酸盐的局部电子结构的近似。他们的结论之一是基态与Zhang-Rice单线态(ZRS)只有$\sim 50$ \%的重叠。这种说法是基于ZRS的定义在不同的表示,其中在Cu网站的电荷波动已被消除的正则变换。基于已知的多带模型(包括Cu的3d $^8$和3d $^{10}$构型)的低能约化程序,对结果的正确解释表明,这种重叠接近94%.
英文摘要:
In a recent work [M. Jiang, M. Moeller, M. Berciu, and G. A. Sawatzky, Phys. Rev. B \textbf{101}, 035151 (2020)], the authors solved a model with a Cu impurity in an O-2p band as an approximation to the local electronic structure of a hole doped cuprate. One of their conclusions is that the ground-state has only $\sim 50$ \% overlap with a Zhang-Rice singlet (ZRS). This claim is based on the definition of the ZRS in a different representation, in which the charge fluctuations at the Cu site have been eliminated by a canonical transformation. The correct interpretation of the results, based on known low-energy reduction procedures for a multiband model including 3d$^8$ and 3d$^{10}$ configurations of Cu, indicates that this overlap is near 94 \%.
Comment on "Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model"
在最近的一封信中,Peets等人测量了过掺杂La $_{2-x}$ Sr $_x$ CuO $_{4\pmδ}$(LSCO)和Tl $_2$ Ba $_2$ CuO $_{6+δ}$中氧K边处的X射线强度。他们声称,与LSCO和YBa $_2$ Cu $_3$ O $_x$的欠掺杂样品不同,在欠掺杂样品中,积分强度至少随掺杂呈线性增加,但当空穴数超过$x\approx 0.23$时,它会突然饱和。他们将饱和解释为铜酸盐中1-能带哈伯德模型的崩溃。然而,我们表明,他们的结果是在定量协议的1带哈伯德模型。
Reply to Comment on "High-field studies of superconducting fluctuations in high-Tc cuprates: Evidence for a small gap distinct from the large pseudogap" by M.V. Ramallo et al
在我们的论文Phys.Rev.B84,014522(2011)中所做的实验研究使我们能够建立超导涨落(SCF)总是随着T的增加而急剧消失。但与Ramallo等人评论中的说法相反,在YBa 2 Cu 3 O {6+x}中测量的SCF的这种急剧截止取决于空穴掺杂和/或无序。因此,我们的数据不能用来声称的普遍性的扩展高斯金兹伯格-朗道理论提出的评论的作者。此外,为了定量地解释我们的数据接近最佳掺杂使用这个模型,他们需要考虑的双层的两个CuO 2平面的波动是完全解耦的,这是没有很好的物理理由。相反,我们所有的数据(介导性,能斯特效应和磁阻)的一致的解释已经完成,考虑到单位电池的两个层之间的耦合是占主导地位的至少高达1.1Tc。
Comment on Multiple Quantum Oscillations in the de Haas - van Alphen Spectra of the Underdoped High-Temperature Superconductor YBa2Cu3O6.5 (A. Audouard et al., Phys. Rev. Lett. 103 (2009) 157003)
Comment on "Variation of the superconducting transition temperature of hole-doped copper oxides"
我们指出了X中间隙方程的错误推导。J. Chen和H. Q. Lin [Phys.Rev.B69(2004)104518; cond-mat/0306680]在多层铜酸盐的层间隧穿(ILT)模型中。其中,在将ILT模型推广到n层单胞情况时,没有考虑ILT有效相互作用在k空间中的局部结构。这是ILT模型的一个特定特征,除了引起间隙函数的高度非平凡的k依赖性之外,已知它以自然的方式提高了临界温度Tc。因此,我们认为Chen和Lin的结果不能像X. J. Chen等人[cond-mat/0408587]。此外,当X.- J. Chen等人的[cond-mat/0408587]应用于n=2的情况,它不能再现原始的ILT间隙方程。然而,一个更仔细的分析多层铜酸盐的ILT模型,考虑到不均匀的空穴分布之间的不等价层,已被早期建议描述所观察到的压力依赖性的Tc在同源系列的高Tc铜酸盐。
Comment on "Light-induced melting of competing stripe orders without introducing superconductivity in La$_{1.875}$Ba$_{0.125}$CuO$_4$" (arXiv:2306.07869v1)
The Low-Temperature Phenomenology of Gap Inhomogeneity in the Cuprate Superconductors: High-Energy Granularity, Low-Energy Homogeneity, and Spectral Kinks