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Metallic ferromagnetism in the 3D Hubbard model at finite temperature

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Abstract

The goal of this work is to examine the possibility of ferromagnetism in a three-dimensional lattice using the Hubbard model with only nearest-neighbor hopping and finite on-site Coulomb interaction (U) and temperature (T) when solved using the dynamical mean-field approximation (DMFA). We calculated the density of states for an fcc lattice with n = 0.6, 0.7 and 0.8, at T = 0.04 t/k B , and with U = 3W where W denotes the non-interacting energy bandwidth. The results reveal magnetization that is nearly saturated and indicate that these systems are metallic. In the particular case where n = 0.6, the magnetization, internal energy and specific-heat versus temperature curves were calculated.

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Authors and Affiliations

  1. Coordination of Physics, Federal Institute of Sergipe, Lagarto-SE, 49400-000, Brazil

    André Neves Ribeiro

  2. Department of Physics, Federal University of Sergipe, Sao Cristovao-SE, 49100-000, Brazil

    Claudio Andrade Macedo

Authors
  1. André Neves Ribeiro
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  2. Claudio Andrade Macedo
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Correspondence to André Neves Ribeiro.

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Ribeiro, A.N., Macedo, C.A. Metallic ferromagnetism in the 3D Hubbard model at finite temperature. Journal of the Korean Physical Society 62, 1445–1448 (2013). https://doi.org/10.3938/jkps.62.1445

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  • DOI: https://doi.org/10.3938/jkps.62.1445

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