Dilution Effects on Two-Dimensional Heisenberg Antiferromagnets with Non-Magnetic Spin-Gapped Ground State
Chitoshi Yasuda, Synge Todo, Munehisa Matsumoto, Hajime Takayama
Abstract
Dilution effects on spin-1/2 quantum Heisenberg antiferromagnets with a non-magnetic spin-gapped ground state are studied by means of the qunatum Monte Carlo simulation. In the site-diluted system, an antiferromagnetic long-range order (AF-LRO) is induced at an infinitesimal concentration of dilution due to an effective coupling Jmn between induced magnetic moments. In the bond-diluted case, on the other hand, the AF-LRO is not induced up to a certain concentration of dilution due to singlet pairs reformed by an AF coupling J af between the edge spins of the diluted bond through the two-dimensional shortest paths. The competition between Jmn and J af yields peculiar phenomena in the bond-diluted system.
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