Phys. Rev. B 45, 7570 (1992)

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Spin correlations in a two-dimensional Heisenberg antiferromagnet doped with static holes

Efstratios Manousakis

Department of Physics and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306

We study the temperature dependence of the spin correlation length of the spin-1/2 Heisenberg antiferromagnet doped with static holes which are uniformly distributed in the square lattice. We have used Handscomb's quantum Monte Carlo method to study lattices of sizes up to 20 x 20 and the high-temperature series expansion. In the doping regime where the system is ordered at T=0, the correlation length can be fit at low temperature by the form xi (T)=c(x)exp[2 pi rho _s(x)/T], where the dependence of the spin stiffness constant rho (x) and of the prefactor c(x) on doping x can be understood by simple scaling arguments. We discuss the implications of these results on the neutron-scattering data obtained on the lightly doped La_2-xSr_xCuO₄.

©1992 The American Physical Society.

PACS: 75.10.Jm 74.20.-z

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