Abstract
The variational cluster approach based on the self-energy functional theory is applied to consider the two-dimensional symmetric periodic Anderson model at half filling We calculate a variety of physical quantities including the single-particle spectra in the thermodynamic limit at zero temperature and show that the symmetry breaking due to antiferromagnetic order of localized spins occurs in the strong coupling region, whereas in the weak coupling region, the Kondo insulating state without symmetry breaking is observed. We thus discuss the competition between antifomagnetim and Kondo seening in heavy fmion ystems.
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