Abstract
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.
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Riseborough, P.S., Coqblin, B. & Magalhães, S.G. The underscreened anderson lattice: A model for uranium compounds. Journal of the Korean Physical Society 62, 1431–1433 (2013). https://doi.org/10.3938/jkps.62.1431
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DOI: https://doi.org/10.3938/jkps.62.1431