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Title: Magnetic and superconducting instabilities in the periodic Anderson model: a random-phase-approximation study
Authors: Peres, Nuno
Araújo, Miguel
Keywords: supercondutividade
rede de Anderson
Issue Date: 10-Jun-2002
Publisher: Journal of Physics Condensed Matter
Citation: Journal of Physics Condensed Matter 14, 5575 (2002)
Abstract: We study the magnetic and superconducting instabilities of the periodic Anderson model with infinite Coulomb repulsion U in the random-phase approximation. The Neel temperature and the superconducting critical temperature are obtained as functions of electronic density (chemical pressure) and hybridization V (pressure). It is found that close to the region where the system exhibits magnetic order the critical temperature T-c is much smaller than the Neel temperature, in qualitative agreement with some T-N/T-c ratios found for some heavy-fermion materials. In our study, the magnetic and superconducting physical behaviour of the system has its origin in the fluctuating boson fields effecting the infinite on-site Coulomb repulsion among the f electrons.
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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