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The Underscreened Anderson Lattice: A Model for Uranium Compounds
Peter S. Riseborough,B. Coqblin,S. G. Magalh˜aes 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We first present a model based on the Underscreened Anderson Lattice with two 5f electrons per site to account for the Kondo-ferromagnetism co-existence observed in some actinide compounds. Then, we analyze the physics behind a novel type of phase transition that appears in the spinrotationally invariant form of the Underscreened Anderson Lattice Model. The model exhibits a continuous phase transition and below the critical temperature a pseudo-gap opens in the density of states. The transition is driven by the spin-flip part of the inter-orbital Hund’s rule interaction which produces a novel order parameter and breaks spin-rotational invariance. It is suggested that this order parameter might describe the “Hidden Order” transition found in URu2Si2.
Observation of two spin gap energies in the filled skutterudite compoundCeOs4Sb12
Adroja, D. T.,Park, J.-G.,Goremychkin, E. A.,McEwen, K. A.,Takeda, N.,Rainford, B. D.,Knight, K. S.,Taylor, J. W.,Park, Jeongmi,Walker, H. C.,Osborn, R.,Riseborough, Peter S. American Physical Society 2007 Physical review. B, Condensed matter and materials Vol.75 No.1