Session P16: Heavy Fermions- Mostly URu2Si2
8:00 AM–11:00 AM, Wednesday, February 29, 2012
Room: 251
Sponsoring Unit:
DCMP
Chair: Jason Jeffries, Lawrence Livermore National Laboratory
Abstract ID: BAPS.2012.MAR.P16.12
Abstract: P16.00012 : Emergent Rank-5 ``Nematic'' Order in URu2Si2
10:12 AM–10:24 AM
Preview Abstract
MathJax On | Off 
Abstract 
Authors:
Hiroaki Ikeda
(Department of Physics, Kyoto University)
Michi-To Suzuki
(CCSE, Japan Atomic Energy Agency)
Ryotaro Arita
(Department of Applied Physics, University of Tokyo)
Tetsuya Takimoto
(Asia Pacific Center for Theoretical Physics, POSTECH)
Takasada Shibauchi
(Department of Physics, Kyoto University)
Yuji Matsuda
(Department of Physics, Kyoto University)
In the strongly correlated $f$-electron systems, novel electronic states often appear due to the interplay between electron correlations and entangled spin and orbital degrees of freedom. A spectacular example is the so-called ``hidden-order'' phase in the heavy-electron metal URu$_{2}$Si$_{2}$. The phase transition is characterized by the large amount of entropy loss observed at $T_{HO}=17.5$K, however no evidence of magnetic/structural phase transition below $T_{HO}$ have been reported so far. Despite efforts over a quarter century, the order parameter has remained unidentified. We show here that the hidden order is a rank-5 multipole (dotriacontapole) state with $E^{-}$ symmetry, based on the first-principles theoretical approach. This novel electronic state provides natural explanations of the key features including anisotropic magnetic excitations, nearly degenerate antiferromagnetic state, and spontaneous fourfold symmetry breaking.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.P16.12