Phys. Rev. Lett. 103, 107202 (2009) [4 pages]Itinerant Magnetic Multipole Moments of Rank Five as the Hidden Order in URu2Si2Received 4 May 2009; revised 20 July 2009; published 1 September 2009 A broken symmetry ground state without any magnetic moments has been calculated by means of the local-density approximation to density functional theory plus a local exchange term, the so-called LDA+U approach, for URu2Si2. The solution is analyzed in terms of a multipole tensor expansion of the itinerant density matrix and is found to be a nontrivial magnetic multipole. Analysis and further calculations show that this type of multipole enters naturally in time reversal breaking in the presence of large effective spin-orbit coupling and coexists with magnetic moments for most magnetic actinides. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.107202
DOI:
10.1103/PhysRevLett.103.107202
PACS:
75.10.Lp, 71.70.Ej, 71.70.Gm, 75.20.Hr
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