自旋近晶态的ε-铁
Epsilon-iron as a spin-smectic state
摘要：
使用X射线发射光谱，我们发现可观的本地磁矩，直到30-40 GPa的高压相的铁，但没有磁序与中子粉末衍射检测到1.8 K与以前的预测相反。我们的第一性原理计算揭示了一个“自旋-近晶”态的能量低于以前的结果。这种状态形成由零自旋双层分离的反铁磁双层，这允许在六方密堆积晶格上的反铁磁性的固有挫折的完全弛豫。由于软层间激发和与其他近晶相的近简并性，磁性双层膜可能是取向无序的。这种可能缺乏长程相关性同意从中子粉末衍射的零结果。一个方向无序的自旋近晶态解决了以前在高压铁中发现的矛盾，并可能成为解释其令人困惑的超导性的组成部分。
英文摘要：
Using x-ray emission spectroscopy, we find appreciable local magnetic moments until 30-40 GPa in the high-pressure phase of iron, however no magnetic order is detected with neutron powder diffraction down to 1.8 K contrary to previous predictions. Our first-principles calculations reveal a "spin-smectic" state lower in energy than previous results. This state forms antiferromagnetic bilayers separated by null spin bilayers, which allows a complete relaxation of the inherent frustration of antiferromagnetism on a hexagonal close-packed lattice. The magnetic bilayers are likely orientationally disordered, owing to the soft interlayer excitations and the near-degeneracy with other smectic phases. This possible lack of long-range correlation agrees with the null results from neutron powder diffraction. An orientationally-disordered, spin-smectic state resolves previously perceived contradictions in high pressure iron and could be integral to explaining its puzzling superconductivity.
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