Magnetic and superconducting instabilities in the periodic Anderson model: an RPA stud

Details Magnetic and superconducting instabilities in the periodic Anderson model: an RPA stud Magnetic and superconducting instabilities in the periodic Anderson model: an RPA stud

2003-03-20

arxiv.org/abs/cond-mat/0303411v1

J. Phys. Condens. Matter 14, 5575 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 2 figures

Scientific paper

10.1088/0953-8984/14/22/310

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, all the magnetic and superconducting physical behaviour of the system has its origin in the fluctuating boson fields implementing the infinite on-site Coulomb repulsion among the f-electrons.

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