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Partial order in the non-Fermi-liquid phase of MnSi

机译:MnSi的非费米液相中的部分有序

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Only a few metallic phases have been identified in pure crystalline materials. These include normal, ferromagnetic and anti-ferromagnetic metals, systems with spin and charge density wave order, and superconductors. Fermi-liquid theory provides a basis for the description of all of these phases. It has been suggested that non-Fermi-liquid phases of metals may exist in some heavy-fermion compounds and oxide materials, but the discovery of a characteristic microscopic signature of such phases presents a major challenge. The transition-metal compound MnSi above a certain pressure (p_c = 14.6 kbar) provides what may be the cleanest example of an extended non-Fermi-liquid phase in a three-dimensional metal. The bulk properties of MnSi suggest that long-range magnetic order is suppressed at p_c (refs 7-12). Here we report neutron diffraction measurements of MnSi, revealing that sizeable quasi-static magnetic moments survive far into the non-Fermi-liquid phase. These moments are organized in an unusual pattern with partial long-range order. Our observation supports the existence of novel metallic phases with partial ordering of the conduction electrons (reminiscent of liquid crystals), as proposed for the high-temperature superconductors and heavy-fermion compounds.
机译:在纯晶体材料中仅发现了少数金属相。其中包括普通金属,铁磁和反铁磁金属,具有自旋和电荷密度波序的系统以及超导体。费米液体理论为描述所有这些相提供了基础。已经提出金属的非费米液相可能存在于一些重费米化合物和氧化物材料中,但是发现这种相的特征性微观特征提出了重大挑战。高于一定压力(p_c = 14.6 kbar)的过渡金属化合物MnSi提供了三维金属中扩展的非费米液相的最干净的例子。 MnSi的整体性质表明,在p_c处,远距离磁阶受到抑制(参考文献7-12)。在这里,我们报告了MnSi的中子衍射测量结果,揭示了相当大的准静态磁矩在非费米液相中仍然存在。这些时刻以不寻常的模式组织,具有部分远程顺序。我们的观察结果支持新型金属相的存在,该金属相具有传导电子的部分排序(让人联想到液晶),这是针对高温超导体和重费米化合物的建议。

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