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- W1997044535 abstract "The method of Gutzwiller is used to reexamine the antiferromagnetism (AF) in a half-filled $s$- band Hubbard model including the band-structure effect. We allow the Fermi surface of an uncorrelated system to deviate from the boundary of the inner-half of the first Brillouin zone (the first magnetic zone) to check the AF stability. A magnetic phase diagram is obtained in a three-dimensional space specified by the number of holes in the first magnetic zone, the spread of Bloch-state energy over the first magnetic zone boundary, and the $frac{U}{W}$ ratio ($U$ is the Hubbard parameter and $W$ is the bare bandwidth). In the phase space a surface separates the AF and the paramagnetic phases. Acorss this surface we found a first-order transition. The characteristic features of these states and the transition are similar to our previous results, except that stronger correlation is required to produce the same effect. Under the condition of a stable AF insulating state, the electron-hole excitation has been investigated for both the relaxed and the frozen final states. The relaxed final state is a magnetic excitation equivalent to a double spin flip in localized picture, and has a finite excitation energy ${ensuremath{Delta}}_{R}$ proportional to the exchange-interaction energy.The frozen final state contains polarized atoms. Therefore, its excitation energy ${ensuremath{Delta}}_{F}$ is proportional to $U$, corresponding to the Mott-Hubbard gap. We found that ${ensuremath{Delta}}_{F}>{ensuremath{Delta}}_{R}$ for all values of $frac{U}{W}$." @default.
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- W1997044535 date "1977-11-01" @default.
- W1997044535 modified "2023-09-27" @default.
- W1997044535 title "Theory of itinerant antiferromagnetism. II. Antiferromagnetic stability and the energy gap" @default.
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- W1997044535 doi "https://doi.org/10.1103/physrevb.16.4126" @default.
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