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arXiv 0707.2104cond-mat.supr-con
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YBa2Cu3Oy和La2-xSrxCuO4中金属-绝缘体交叉点下涡旋的自旋玻璃态

Spin-glass state of vortices in YBa2Cu3Oy and La2-xSrxCuO4 below the metal-to-insulator crossover

J. E. Sonier, F. D. Callaghan, Y. Ando, R. F. Kiefl, J. H. Brewer, C. V. Kaiser, V. Pacradouni, S. A. Sabok-Sayr, X. F. Sun, S. Komiya, W. N. Hardy, D. A. Bonn, R. Liang

摘要:

在两个不同的高转变温度超导体家族中,通过μ子自旋旋转检测到高度无序的磁性仅限于单个弱相互作用的涡旋,但仅在低温正常状态金属-绝缘体交叉(MIC)的低掺杂侧的样品中。结果支持扩展的量子相变(QPT)理论的竞争的磁性和超导订单,包括氧化铜平面之间的耦合。与以前的实验所推断的相反,与超导性共存的静态磁性在场致QPT附近是不有序的。我们的研究结果揭开了MIC的神秘面纱,并建立了高温超导体的正常状态是无处不在的超导相的磁量子临界点。

英文摘要:

Highly disordered magnetism confined to individual weakly interacting vortices is detected by muon spin rotation in two different families of high-transition-temperature superconductors, but only in samples on the low-doping side of the low-temperature normal state metal-to-insulator crossover (MIC). The results support an extended quantum phase transition (QPT) theory of competing magnetic and superconducting orders that incorporates the coupling between CuO2 planes. Contrary to what has been inferred from previous experiments, the static magnetism that coexists with superconductivity near the field-induced QPT is not ordered. Our findings unravel the mystery of the MIC and establish that the normal state of high-temperature superconductors is ubiquitously governed by a magnetic quantum critical point in the superconducting phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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