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- W1963529627 abstract "We investigate the antiferromagnetic moment of heavy quasi-particles in the U -infinite degenerate Anderson lattice model of the square lattice where the renormalized bands have the nested Fermi surface. The conduction electron component M c and the f-electron component M f of the antiferromagnetic moment are treated separately. We find that M f / M c is ruled by the single parameter m * / m as (M_{rm f} /M_{rm c} cong (g_{rm f} /g_{rm c})(m^ast /m)). In addition, in the Kondo regime, M f is almost proportional to the number of f-electrons n f , and independent of m * / m , while M c is almost proportional to ( m * / m ) -1 , i.e. (M_{rm f} cong g_{rm f} mu_{rm B} cdot k n_{rm f}) and (M_{rm c} cong g_{rm c} mu_{rm B} cdot k rho_{rm c} T_{rm K}), where ρ c represents the D.O.S of the conduction electron band. The coefficient k depends on local moments M ion of f-electrons under crystal fields and the degree of the nesting effect. At the limiting case that the Fermi surface is perfectly nested and (M_{rm ion}=frac{5}{2}g_{rm f} mu_{rm B}), k reaches about 1, thus M f reaches about 1 g f µ B at the limit of n f →1, i.e. 40% of M ion , where the total moment M (= M c + M f ) nearly equals M f in the Kondo regime. As the degree of the nesting effect decreases, k approaches zero, and then the system becomes nonmagnetic when k equals zero." @default.
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- W1963529627 date "1998-03-15" @default.
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- W1963529627 title "Itinerant Electron Antiferromagnetism in the Anderson Lattice Model" @default.
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- W1963529627 doi "https://doi.org/10.1143/jpsj.67.927" @default.
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