Dilution Effects on Two-Dimensional Heisenberg Antiferromagnets with Non-Magnetic Spin-Gapped Ground State
Dilution Effects on Two-Dimensional Heisenberg Antiferromagnets with Non-Magnetic Spin-Gapped Ground State
复制标题
非磁性自旋能隙基态二维海森堡反铁磁体的稀释效应
DOI：
10.1143/ptps.145.339
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发表时间：
2002
影响因子：
--
通讯作者：
H. Takayama
中科院分区：
文献类型：
--
作者：
C. Yasuda;S. Todo;M. Matsumoto;H. Takayama
利用量子蒙特卡罗模拟研究了非磁性自旋间隙基态自旋1 / 2量子海森堡反铁磁体的稀释效应。在位置稀释体系中，由于诱导磁矩之间的有效耦合J m n，在无限小的稀释浓度下诱导反铁磁长程序（AF-LRO）。另一方面，在键被稀释的情况下，由于在被稀释的键的边缘自旋之间通过二维最短路径发生AF耦合J a f而形成的单线态对，导致AF- lro没有被诱导到一定的稀释浓度。jmn和jaf之间的竞争在键稀释体系中产生了特殊的现象。
Dilution effects on spin-½ 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 m n 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 a f between the edge spins of the diluted bond through the two-dimensional shortest paths. The competition between J m n and J a f yields peculiar phenomena in the bond-diluted system.