Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-08-11
Phys.Rev. B64 (2001) 092511
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, revtex, 5 embeeded figures
Scientific paper
10.1103/PhysRevB.64.092511
We study the destruction of the antiferromagnetic order in the high-Tc superconductors La(2-x)Sr(x)CuO(4) and YBa(2)Cu(3)O(6+x) in the framework of the CP1-nonlinear sigma model formulation of the 2D quantum Heisenberg antiferromagnet. The dopants are introduced as independent fermions with appropriate dispersion relations determined by the shape of the Fermi surface. The energy of skyrmion topological defects, which are shown to be introduced by doping, is used as an order parameter for antiferromagnetic order. We obtain analytic expressions for this as a function of doping which allow us to plot the curves T_N(x_c)\times x_c and M(x)\times x, for both YBCO and LSCO, in good quantitative agreement with the experimental data.
Marino Eduardo C.
Silva Neto Marcello B.
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