Magnetic Properties of Weakly Doped Antiferromagnets

Details Magnetic Properties of Weakly Doped Antiferromagnets Magnetic Properties of Weakly Doped Antiferromagnets

1999-10-28

arxiv.org/abs/cond-mat/9910474v1

Phys.Rev.B 60, 12329 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages

Scientific paper

10.1103/PhysRevB.60.12329

We study the spin excitations and the transverse susceptibility of a two-dimensional antiferromagnet doped with a small concentration of holes in the t-J model. The motion of holes generates a renormalization of the magnetic properties. The Green's functions are calculated in the self-consistent Born approximation. It is shown that the long-wavelength spin waves are significantly softened and the shorter-wavelength spin waves become strongly damped as the doping increases. The spin wave velocity is reduced by the coherent motion of holes, and not increased as has been claimed elsewhere. The transverse susceptibility is found to increase considerably with doping, also as a result of coherent hole motion. Our results are in agreement with experimental data for the doped copper oxide superconductors.

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