对URu2Si2中5f对称性的直接体敏感探针。
Direct bulk-sensitive probe of 5f symmetry in URu2Si2.
作者信息
Sundermann Martin, Haverkort Maurits W, Agrestini Stefano, Al-Zein Ali, Moretti Sala Marco, Huang Yingkai, Golden Mark, de Visser Anne, Thalmeier Peter, Tjeng Liu Hao, Severing Andrea
机构信息
Institute of Physics II, University of Cologne, 50937 Cologne, Germany.
Max-Planck-Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
出版信息
Proc Natl Acad Sci U S A. 2016 Dec 6;113(49):13989-13994. doi: 10.1073/pnas.1612791113. Epub 2016 Nov 21.
The second-order phase transition into a hidden order phase in URuSi goes along with an order parameter that is still a mystery, despite 30 years of research. However, it is understood that the symmetry of the order parameter must be related to the symmetry of the low-lying local electronic [Formula: see text]-states. Here, we present results of a spectroscopic technique, namely core-level nonresonant inelastic X-ray scattering (NIXS). This method allows for the measurement of local high-multipole excitations and is bulk-sensitive. The observed anisotropy of the scattering function unambiguously shows that the 5[Formula: see text] ground-state wave function is composed mainly of the [Formula: see text] with majority [Formula: see text] = [Formula: see text] + [Formula: see text] and/or [Formula: see text] singlet states. The incomplete dichroism indicates the possibility that quantum states of other irreducible representation are mixed into the ground state.
在URuSi中二阶相变进入隐藏序相伴随着一个序参量，尽管经过30年的研究，这个序参量仍然是个谜。然而，可以理解的是，序参量的对称性必须与低能局域电子[公式：见正文]态的对称性相关。在此，我们展示了一种光谱技术的结果，即芯能级非共振非弹性X射线散射（NIXS）。这种方法能够测量局域高多重极激发，并且对体材料敏感。所观察到的散射函数的各向异性明确表明，5[公式：见正文]基态波函数主要由[公式：见正文]组成，其中多数[公式：见正文] = [公式：见正文] + [公式：见正文]和/或[公式：见正文]单重态。不完全二向色性表明其他不可约表示的量子态可能混入基态。
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