Magnetic phase diagram of the Hubbard model

Abstract

The competition between commensurate and incommensurate spin-density-wave phases in the infinite-dimensional single-band Hubbard model is examined with quantum Monte Carlo simulation and strong and weak coupling approximations. Quantum fluctuations modify the weak-coupling phase diagram by factors of order unity and produce remarkable agreement with the quantum Monte Carlo data, but strong-coupling theories (that map onto effective Falicov-Kimball models) display pathological behavior. The single-band model can be used to describe much of the experimental data in Cr and its dilute alloys with V and Mn.

12 pages plus 3 uuencoded postscript figures, ReVTeX

References in corpus (2)

• Conserving approximations for the attractive Holstein and Hubbard models
• A partition functional and thermodynamic properties of the infinite-dimensional Hubbard model

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