Multipole fluctuations of itinerant f electrons and triakontadipole order in URu2Si2

作者：Ikeda Hiroaki^*; Suzuki Michi To; Arita Ryotaro; Takimoto Tetsuya

来源：Comptes Rendus Physique, 2014, 15(7): 587-598.

DOI：10.1016/j.crhy.2014.07.002

• Hidden order
• URu2Si2
• Multipolar order
• Multipolar fluctuations

Novel electronic states are hallmarks of strongly correlated f-electron systems. The spin-orbital coupled degrees of freedom can lead to an exotic type of multipole hidden order (HO). A well-known HO is observed at the 17.5 K phase transition in URu2Si2, which is a long-standing mystery since its discovery in 1985. The dominating itinerant character of the 5f electrons complicates a theoretical description of this phenomenon. Here we review recent progress on a first-principles theoretical approach that allows catching the itinerant feature of f electrons. We show that in the itinerant 5f-electron model of URu2Si2, the most divergent multipole susceptibility indicates an instability to a triakontadipole order, with a doubly degenerate E-type symmetry. This itinerant-type multipole order is consistent with key features in the HO state, including the broken fourfold rotational symmetry observed in recent experiments.

• 出版日期2014-9
• 单位RIKEN