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Magnetic Phase Diagram of Hubbard Model in Three Dimensions: the Second-Order Local Approximation

A. N. Tahvildar-Zadeh·J. K. Freericks·M. Jarrell
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Abstract

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.

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A. N. Tahvildar-Zadeh, J. K. Freericks, M. Jarrell. 1996-04-05. Magnetic Phase Diagram of Hubbard Model in Three Dimensions: the Second-Order Local Approximation. https://doi.org/10.1103/physrevb.55.942

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