Bond-Dilution Effects on Two-Dimensional Spin-Gapped Heisenberg Antiferromagnets

Details Bond-Dilution Effects on Two-Dimensional Spin-Gapped Heisenberg Antiferromagnets Bond-Dilution Effects on Two-Dimensional Spin-Gapped Heisenberg Antiferromagnets

2001-09-07

arxiv.org/abs/cond-mat/0109137v1

J. Phys. Chem. Solids 63, 1607 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures

Scientific paper

10.1016/S0022-3697(02)00046-X

Bond-dilution effects on spin-1/2 spin-gapped Heisenberg antiferromagnets of coupled alternating chains on a square lattice are investigated by means of the quantum Monte Carlo method. It is found that, in contrast with the site-diluted system having an infinitesimal critical concentration, the bond-diluted system has a finite critical concentration of diluted bonds, $x_{c}$, above which the system is in an antiferromagnetic (AF) long-range ordered phase. In the disordered phase below $x_{c}$, plausibly in the concentration region significantly less than $x_{c}$, the system has a spin gap due to singlet pairs of induced magnetic moments reformed by the AF interactions through the two-dimensional shortest paths.

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