What do we learn from impurities and disorder in high-Tc cuprates?

IF 1.9 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Frontiers in Physics Pub Date : 2024-09-05 DOI:10.3389/fphy.2024.1406242
Henri Alloul
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Abstract

A series of experimental studies established that the differing morphologies of the phase diagrams versus hole doping nh of the various cuprate families are mostly controlled by defects and disorder. In the minimally disordered cuprate Yttrium Baryum Copper Oxide (YBCO) we introduced controlled detfects that allowed us to probe the metallic and superconducting states. We demonstrate that the extent of the spin glass phase and the superconducting dome can be controlled by the concentration of spinless (Zn, Li) impurities substituted on the planar Cu sites. NMR frequency shift measurements establish that these defects induce, in their vicinity, a cloud with a Kondo-like paramagnetic behavior. Its “Kondo” temperature and spatial extent differ markedly between the pseudogap and strange metal regimes. We have performed transport measurements on single crystals with a controlled content of in-plane vacancies introduced by electron irradiation. At high T, the inelastic scattering of the carriers has been found independent of disorder and completely governed by the excitations of the correlated electronic state. The low T upturns in the resistivity associated with single-site Kondo-like scattering are qualitatively in agreement with local magnetism induced by spinless impurities. The apparent metal insulator crossover is only detected for a very large defect content, and part of the large resistivity upturn remains connected with Kondo-like paramagnetism. In the superconducting state, the defect-induced reduction of Tc scales linearly with the increase in residual resistivity induced by disorder. High-field magnetoresistance experiments permit us to determine the paraconductivity due to superconducting fluctuations. The latter vanishes beyond a temperature T’c and a field H’c that both decrease with increasing in-plane defect content. In the pseudogap regime, the weaker decrease of T’c with respect to that of Tc reveals a large loss of superconducting phase coherence in the presence of disorder. In light of our experimental results, we initiate a discussion of its interplay with pair breaking. Our data also permit us to confirm that the differing phase diagrams are due to competing orders or disorders that are family-specific. In the ideal phase diagram of a disorder-free cuprate, 2D superconductivity should persist at low doping. This ensemble of experimental results provides serious challenges for the theoretical understanding of superconductivity in these correlated electron systems.
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从高碲铜氧化物的杂质和无序中我们能学到什么?
一系列实验研究表明,不同铜氧化物家族的相图形态与空穴掺杂量 nh 的关系主要受缺陷和无序控制。在无序度极低的铜氧化钇(YBCO)中,我们引入了可控的缺陷,从而能够探测金属态和超导态。我们证明,自旋玻璃相和超导穹顶的程度可以通过平面铜位点上取代的无自旋(锌、锂)杂质浓度来控制。核磁共振频移测量证实,这些缺陷会在其附近诱发具有近藤顺磁行为的云。它的 "Kondo "温度和空间范围在伪间隙和奇异金属状态下有明显差异。我们对通过电子辐照引入的面内空位含量可控的单晶体进行了传输测量。研究发现,在高 T 时,载流子的非弹性散射与无序无关,完全受相关电子态的激发控制。与单点近藤散射相关的电阻率低 T 上升与无自旋杂质诱导的局部磁性在性质上是一致的。只有在缺陷含量非常大的情况下,才能检测到明显的金属绝缘体交叉,大电阻率上升的一部分仍然与近藤样顺磁性有关。在超导状态下,缺陷引起的 Tc 下降与无序引起的残余电阻率上升成线性比例。通过高场磁阻实验,我们可以确定超导波动引起的副导性。后者在温度 T'c 和磁场 H'c 之后消失,而温度 T'c 和磁场 H'c 都会随着面内缺陷含量的增加而降低。在伪隙机制中,T'c 相对于 Tc 的减小程度较弱,这表明在存在无序的情况下,超导相干性会大量丧失。根据我们的实验结果,我们开始讨论它与配对断裂之间的相互作用。我们的数据还使我们能够确认,不同的相图是由于竞争秩序或家族特有的无序造成的。在无序杯石的理想相图中,二维超导性应在低掺杂时持续存在。这一系列实验结果为理论上理解这些相关电子系统的超导性提出了严峻的挑战。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Physics
Frontiers in Physics Mathematics-Mathematical Physics
CiteScore
4.50
自引率
6.50%
发文量
1215
审稿时长
12 weeks
期刊介绍: Frontiers in Physics publishes rigorously peer-reviewed research across the entire field, from experimental, to computational and theoretical physics. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, engineers and the public worldwide.
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