Magnetic phase diagram of the Hubbard model

Details Magnetic phase diagram of the Hubbard model Magnetic phase diagram of the Hubbard model

1994-07-25

arxiv.org/abs/cond-mat/9407101v1

Physics

Condensed Matter

12 pages plus 3 uuencoded postscript figures, ReVTeX

Scientific paper

10.1103/PhysRevLett.74.186

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.

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