Comment on ``Magnetic Susceptibility of the two-dimensional Hubbard model ''

Details Comment on ``Magnetic Susceptibility of the two-dimensional Hubbard model '' Comment on ``Magnetic Susceptibility of the two-dimensional Hubbard model ''

1993-09-09

arxiv.org/abs/cond-mat/9309009v1

Phys. Rev. B 49, 4338-4340 (1994) (3 pages)

Physics

Condensed Matter

8 pages, LaTex, CRPS-93-31

Scientific paper

10.1103/PhysRevB.49.4338

The observed magnetic spin susceptibility of high-temperature superconductors such as La$_{2- x}$Sr$_x$CuO$_4$ increases when $x$ increases from zero, i.e. as one dopes away from half-filling. Recent Monte Carlo simulations of A. Moreo (Phys. Rev. B {\bf 48}, 3380 (1993)) suggest that this behavior can be reproduced by the two-dimensional Hubbard model only at large coupling, namely, $U/t$ of order $10$. Using longer runs, our Monte Carlo simulations show that the same behavior as for $U/t=10$ is obtained even in the intermediate coupling regime ($U/t=4$), as long as the temperature is low enough ($T=t/6$) that strong antiferromagnetic correlations are building up at half-filling. These results are consistent with the fact that in two-dimensions, the GRPA should fail in the parameter range where it predicts a magnetic phase transition.

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