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- W2023976733 abstract "The ferromagnetic-exchange-interaction model is studied by the Oguchi method and the constant-coupling approximation (CCA). The polarization q(T), which describes the ordering of the model, is determined for various spins. The phase transition is first order for all spins Sensuremath{ge}1. The transition temperature obtained with the CCA is ${mathit{kT}}_{mathit{c}}$/J=2/{lnS(2S-1)-ln[(2S${)}^{mathrm{ensuremath{zeta}}}$-S(2S+1)]}, where ensuremath{zeta} depends on the lattice coordination number z and is given by ensuremath{zeta}=2(z-1)/z. Both the CCA and the Oguchi method show that the discontinuity of q at ${mathit{T}}_{mathit{c}}$ is ${mathit{q}}_{mathit{c}}$=(2S-1)/2S, which is exactly the same as the mean-field result." @default.
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- W2023976733 date "1993-10-01" @default.
- W2023976733 modified "2023-09-26" @default.
- W2023976733 title "Constant-coupling approximation of the exchange-interaction model of ferromagnetism" @default.
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- W2023976733 doi "https://doi.org/10.1103/physrevb.48.9456" @default.
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