Magnetic Phase Diagram of Hubbard Model in Three Dimensions: the Second-Order Local Approximation
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چکیده
A local, second-order (truncated) approximation is applied to the Hubbard model in three dimensions. Lowering the temperature, at half-filling, the paramagnetic ground state becomes unstable towards the formation of a commensurate spin-density-wave (SDW) state (antiferromagnetism) and sufficiently far away from half-filling towards the formation of incommensurate SDW states. The incommensurate-ordering wavevector does not deviate much from the commensurate one, which is in accord with the experimental data for the SDW in chromium alloys. Typeset using REVTEX 1
منابع مشابه
Magnetic phase diagram of the Hubbard model in three dimensions: The second-order local approximation
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تاریخ انتشار 2008