@article{f5a96018b7a1437aa776f52e158d4d91,
title = "Multipole fluctuations of itinerant f electrons and triakontadipole order in URu2Si2",
abstract = "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.",
keywords = "Hidden order, Multipolar fluctuations, Multipolar order, URuSi",
author = "Hiroaki Ikeda and Suzuki, {Michi To} and Ryotaro Arita and Tetsuya Takimoto",
note = "Funding Information: This review is based on the work in collaboration with T. Shibauchi and Y. Matsuda. We thank K. Ishida, K. Ueda, J. Flouquet, D. Aoki, G. Knebel, F. Bourdarot, M. Sigrist, T.M. Rice, P. Thalmeier, C. Geibel, F. Steglich, Y. Kitaoka, J.A. Mydosh, P.M. Oppeneer, Y. Kuramoto, C.M. Varma, K. Haule, G. Kotliar, P.S. Riseborough, P. Chandra, P. Coleman, R. Caciuffo, J. Schmalian and Y. Zaanen for helpful discussions. This work was partially supported by Grant-in-Aid for the Global COE program “The Next Generation of Physics, Spun from Universality and Emergence”, Grant-in-Aid for Scientific Research on Innovative Areas “Heavy Electrons” ( 20102002 , 20102006 ) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan , and KAKENHI ( 23340095 , 24540369 ) from Japan Society for the Promotion of Science (JSPS). Publisher Copyright: {\textcopyright} 2014 Acad{\'e}mie des sciences.",
year = "2014",
month = aug,
day = "1",
doi = "10.1016/j.crhy.2014.07.002",
language = "English",
volume = "15",
pages = "587--598",
journal = "Comptes Rendus Physique",
issn = "1631-0705",
publisher = "Elsevier Masson",
number = "7",
}