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No mixing of superconductivity and antiferromagnetism in a high-temperature superconductor

机译：高温超导体中不会混合超导性和反铁磁性

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There is still no universally accepted theory of high-temperature superconductivity. Most models assume that doping creates 'holes' in the valence band of an insulating, antiferromagnetic 'parent' compound, and that antiferromagnetism and high-temperature superconductivity are intimately related(1-8). If their respective energies are nearly equal, strong antiferromagnetic fluctuations (temporally and spatially restricted antiferromagnetic domains) would be expected in the superconductive phase, and superconducting fluctuations would be expected in the antiferromagnetic phase(7); the two states should 'mix' over an extended length scale(8). Here we report that one-unit-cell-thick antiferromagnetic La2CuO4 barrier layers remain highly insulating and completely block a supercurrent; the characteristic decay length is 1 Angstrom, indicating that the two phases do not mix. We likewise found that isolated one-unit-cell-thick layers of La1.85Sr0.15CuO4 remain superconducting. The latter further implies that, on doping, new electronic states are created near the middle of the bandgap. These two findings are in conflict with most proposed models, with a few notable exceptions that include postulated spin-charge separation(2). [References: 23]
机译：高温超导理论还没有被普遍接受的理论。大多数模型都假设掺杂会在绝缘的反铁磁``母体''化合物的价带中产生``空洞''，并且反铁磁与高温超导性密切相关（1-8）。如果它们各自的能量几乎相等，则在超导相中会出现强烈的反铁磁波动（在时间和空间上受到限制的反铁磁畴），而在反铁磁相中会出现超导波动（7）;两种状态应在扩展长度范围内“混合”（8）。在这里，我们报道了一个单细胞厚的反铁磁La2CuO4势垒层保持高度绝缘并完全阻挡了超电流。特征衰减长度为1埃，表明两相没有混合。我们同样发现，隔离的La1.85Sr0.15CuO4的单胞厚层仍然是超导的。后者进一步暗示，在掺杂时，在带隙中间附近产生新的电子状态。这两个发现与大多数提出的模型相矛盾，只有几个显着的例外，包括假定的自旋电荷分离（2）。 [参考：23]

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