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Spin fluctuations in YBa_2Cu_3O_(6.6)

机译：YBa_2Cu_3O_（6.6）中的自旋涨落

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摘要

An important feature of the high-transition-temperature (high-T_c) copper oxide superconductors is the magnetism that results from the spins associated with the incomplete outer electronic shells (3d~9) of the copper ions. Fluctuations of these spins give rise to magnetic excitations of the material, and might mediate the electron pairing that leads to superconductivity. If the mechanism for high-T_c superconductivity is the same for all copper oxide systems, their spin fluctuations should be universal. But so far, the opposite has seemed to be the case: neutron scattering data reveal clear differences between the spin fluctuations for two major classes of high- T_c materials, La_(2-x)Sr_xCuO_4 (refs 1-3) and YBa_2Cu_3O_(7-x) (refs 4-6), whose respective building blocks are CuO_2 layers and bilayers. Here we report two-dimensional neutron-scattering imaging of YBa_2Cu_3O_(6.6), which reveals that the low-frequency magnetic excitations are virtually identical to those of similarly doped La_(2-x)Sr_xCuO_4. Thus, the high-temperature (T_c approx< 92 K) superconductivity of the former materials may be related to spatially coherent low-frequency spin excitations that were previously thought to be unique to the lower- T_c (< 40 K) single-layer La_(2-x)Sr_xCuO_4 family.
机译：高转变温度（high-T_c）氧化铜超导体的一个重要特征是磁性，该磁性是由与铜离子不完整的外部电子外壳（3d〜9）相关的自旋所产生的。这些自旋的波动会引起材料的磁激发，并可能介导导致超导的电子对。如果对于所有氧化铜系统来说，高T_c超导性的机理都相同，则它们的自旋涨落应该是普遍的。但到目前为止，情况似乎恰恰相反：中子散射数据揭示出两种主要的高T_c材料La_（2-x）Sr_xCuO_4（参考1-3）和YBa_2Cu_3O_（7）的自旋涨落之间存在明显差异。 -x）（参考文献4-6），其各自的构成模块是CuO_2层和双层。在这里，我们报告YBa_2Cu_3O_（6.6）的二维中子散射成像，它揭示了低频磁激发实际上与相似掺杂的La_（2-x）Sr_xCuO_4的激发相同。因此，前一种材料的高温（T_c约<92 K）超导性可能与空间相干的低频自旋激发有关，以前人们认为它们是较低的T_c（<40 K）单层La_唯一的。 （2-x）Sr_xCuO_4系列。

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