Dilution Effects on Two-Dimensional Heisenberg Antiferromagnets with Non-Magnetic Spin-Gapped Ground State

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概要

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• Dilution effects on spin-1/2 quantum Heisenberg antiferromagnets with a non-magnetic spin-gapped ground state are studied by means of the quantum 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 J_<mn> 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 J_<mn> and J_<af> yields peculiar phenomena in the bond-diluted system.

• 理論物理学刊行会の論文
• 2002-06-28

著者

• Takayama H

  Univ. Tokyo Kashiwa Jpn

• TAKAYAMA Hajime

  Institute for Solid State Physics, University of Tokyo

• TAKAYAMA Hajime

  The Institute for Solid State Physics, The University of Tokyo

• YASUDA Chitoshi

  Institute for Solid State Physics, University of Tokyo

• TODO Synge

  Institute for Solid State Physics, University of Tokyo

• MATSUMOTO Munehisa

  Institute for Solid State Physics, University of Tokyo

• Takayama Hajime

  Institute For Solid State Physics University Of Tokyo

• Todo Synge

  Department Of Applied Physics University Of Tokyo:crest Japan Science And Technology Agency

• Todo Synge

  Institute For Solid State Physics University Of Tokyo

• Yasuda Chitoshi

  Department Of Physics And Mathematics Aoyama Gakuin University

• Yasuda C

  Sci. Univ. Tokyo Chiba

• Matsumoto Munehisa

  Institute For Solid State Physics University Of Tokyo

• Takayama Hajime

  Institute For Solid State Physics The University Of Tokyo

• Takayama Hajime

  Department Of Physics Faculty Of Science Hokkaido University

• TAKAYAMA Hajime

  Research Institute for Fundamental Phisics, Kyoto University

• TODO Synge

  Institute for Solid State Physics, University of Tokyo:Theoretische Physik, Eidgenossische Technische Hochschule

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