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Resonance as a measure of pairing correlations in the high-T_c superconductor YBa_2Cu_3O_(6.6)

机译：共振作为高T_c超导体YBa_2Cu_3O_（6.6）中配对相关性的量度

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One of the most striking properties of the high-transition-temperature (high-T_c) superconductors is that they are all derived from insulating antiferromagnetic parent compounds. The intimate relationship between magnetism and superconductivity in these copper oxide materials has intrigued researchers from the outset, because it does not exist in conventional superconductors. Evidence for this link comes from neutron-scattering experiments that show the unambiguous presence of short-range antiferromagnetic correlations (excitations) in the high-T_c superconductors. Even so, the role of such excitations in the pairing mechanism for superconductivity is still a subject of controversy. For YBa_2Cu_3O_(6+x), where x controls the hole-doping level, the most prominent feature in the magnetic excitation spectrum is a sharp resonance (refs 6-11). Here we show that for underdoped YBa_2Cu_3O_(6.6), where x and T_c are below their optimal values, modest magnetic fields suppress the resonance significantly, much more so for fields approximately perpendicular to the CuO_2 planes than for parallel fields. Our results indicate that the resonance measures pairing and phase coherence, suggesting that magnetism plays an important role in high-T_c superconductivity. The persistence of a field effect above T_c favours mechanisms in which the superconducting electron pairs are pre-formed in the normal state of underdoped copper oxide superconductors, awaiting transition to the superconducting state.
机译：高转变温度（high-T_c）超导体最引人注目的特性之一是它们都衍生自绝缘反铁磁母体化合物。这些氧化铜材料中的磁性与超导性之间的密切关系从一开始就引起了研究人员的兴趣，因为常规超导体中不存在这种关系。这种联系的证据来自中子散射实验，这些实验表明在高T_c超导体中明确存在短程反铁磁相关性（激发）。即便如此，这种激发在超导性配对机制中的作用仍然是一个有争议的话题。对于YBa_2Cu_3O_（6 + x），其中x控制空穴掺杂能级，磁激发光谱中最显着的特征是尖锐的共振（参考文献6-11）。在这里，我们表明，对于x和T_c低于其最佳值的YBa_2Cu_3O_（6.6）掺杂不足，适度的磁场会显着抑制谐振，与垂直于CuO_2平面的场相比，平行磁场的影响要大得多。我们的结果表明，谐振测量了配对和相干，表明磁性在高T_c超导中起着重要作用。高于T_c的场效应的持久性有利于这样的机制，其中超导电电子对在掺杂不足的氧化铜超导体的正常状态下预形成，等待转变为超导状态。

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