Metamagnetism in the 2D Hubbard Model with easy axis

Details Metamagnetism in the 2D Hubbard Model with easy axis Metamagnetism in the 2D Hubbard Model with easy axis

1997-08-13

arxiv.org/abs/cond-mat/9708091v1

Phys. Rev. B 56 (1997) R10005--10008

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX 5 pages + 2 postscript figures (included), accepted for PRB Rapid Communications

Scientific paper

10.1103/PhysRevB.56.R10005

Although the Hubbard model is widely investigated, there are surprisingly few attempts to study the behavior of such a model in an external magnetic field. Using the Projector Quantum Monte Carlo technique, we show that the Hubbard model with an easy axis exhibits metamagnetic behavior if an external field is turned on. For the case of intermediate correlations strength $U$, we observe a smooth transition from an antiferromagnetic regime to a paramagnetic phase. While the staggered magnetization will decrease linearly up to a critical field $B_c$, uniform magnetization develops only for fields higher than $B_c$.

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