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- W2095858954 abstract "We investigate magnetization as functions of external magnetic field $H$ in the $U$-infinite Anderson lattice model within the leading order approximation in the $1/N$-expansion. At $T=0$, at $H=H_M$ where the Zeeman energy is equal to a certain characteristic energy in the system, the magnetization curve has a kink and the differential susceptibility $dM/dH$ shows a jump. At finite temperature, $dM/dH$ shows a peak around $H_M$. Its maximum value increases with decreasing $T$ and saturates to a finite value at $Tto 0$. When $H<H_M$, the $f$ and the conduction electrons form the renormalized bands with a large Fermi surface determined by the Luttinger sum rule. On the other hand, when $H>H_M$, the bands reform themselves significantly free from the Luttinger sum rule, eventually leading to a small Fermi surface at $H gg H_M$. The results are consistent with the metamagnetic properties observed in the heavy fermion CeRu$_2$Si$_2$." @default.
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- W2095858954 title "Metamagnetism and Fermi Surface in the Anderson Lattice Model" @default.
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- W2095858954 doi "https://doi.org/10.1143/jpsj.65.19" @default.
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