Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France.
Service de Modélisation et d'Exploration des Matériaux, Université Grenoble Alpes et Commissariat á l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France.
Nat Commun. 2016 Oct 20;7:13075. doi: 10.1038/ncomms13075.
URuSi is one of the most enigmatic strongly correlated electron systems and offers a fertile testing ground for new concepts in condensed matter science. In spite of >30 years of intense research, no consensus on the order parameter of its low-temperature hidden-order phase exists. A strong magnetic field transforms the hidden order into magnetically ordered phases, whose order parameter has also been defying experimental observation. Here, thanks to neutron diffraction under pulsed magnetic fields up to 40 T, we identify the field-induced phases of URuSi as a spin-density-wave state. The transition to the spin-density wave represents a unique touchstone for understanding the hidden-order phase. An intimate relationship between this magnetic structure, the magnetic fluctuations and the Fermi surface is emphasized, calling for dedicated band-structure calculations.
URuSi 是最神秘的强关联电子系统之一，为凝聚态物理科学中的新概念提供了肥沃的试验场。尽管经过了 30 多年的深入研究，但对于其低温隐藏有序相的序参量仍没有共识。强磁场将隐藏序转变为磁有序相，其序参量也一直难以通过实验观察到。在这里，由于在高达 40T 的脉冲磁场下进行了中子衍射实验，我们确定了 URuSi 的场致相为自旋密度波态。向自旋密度波的转变代表了理解隐藏有序相的独特试金石。这种磁结构、磁涨落和费米面之间的密切关系被强调，需要进行专门的能带结构计算。
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