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首页> 外文会议>Strongly Correlated Electron Materials: Physics and Nanoengineering >Combined Neutron Scattering and Muon-Spin Rotation Investigations of the Abrikosov State of High-Temperature Superconductors
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Combined Neutron Scattering and Muon-Spin Rotation Investigations of the Abrikosov State of High-Temperature Superconductors

机译：高温超导体的Abrikosov态的中子散射和μ自旋旋转联合研究

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摘要

The magnetic phase diagram of high-temperature superconductors can contain many exotic vortex phases not observed in conventional superconducting materials. For example, the familiar vortex lattice may melt at high temperatures into a vortex liquid. The influence of defects, which pin the vortices, is of particular interest from both a theoretical and an experimental point of view. We have used a combination of small angle neutron scattering (SANS) and muon-spin rotation to probe the order of the vortex system on a microscopic scale and have succeeded, for the first time, to measure a well-ordered vortex lattice (VL) structure at all doping regimes of LSCO. In the optimally to overdoped regime a field-induced transition from hexagonal to square coordination is reported. The possible connections of our neutron results to photoemission data, as well as the implications for various competing theoretical models will be discussed. In the underdoped regime we observe, as a function of applied magnetic field, a transition from an ordered vortex state to a vortex glass phase that results from the presence of random pinning. Finally, recent measurements of the VL on electron doped high-temperature superconductors are presented.
机译：高温超导体的磁相图可能包含许多在常规超导材料中未观察到的奇异涡旋相。例如，熟悉的涡旋晶格可在高温下熔化成涡旋液体。从理论和实验的角度来看，引起涡旋的缺陷的影响都特别令人关注。我们结合了小角度中子散射（SANS）和μ自旋旋转技术，在微观尺度上探测了涡旋系统的阶次，并首次成功地测量了秩序良好的涡旋晶格（VL） LSCO的所有掺杂方案的结构。据报道，在最佳到过度掺杂的状态下，由场引起的从六方配位到方形配位的跃迁。我们将讨论中子结果与光发射数据之间可能的联系，以及对各种竞争性理论模型的影响。在欠掺杂状态下，我们观察到，作为施加的磁场的函数，由于存在随机钉扎，导致从有序涡旋状态到涡旋玻璃相的转变。最后，介绍了最近在电子掺杂的高温超导体上的VL测量。

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