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a collinear bipartite antiferromagnet composed of two interpenetrating square lattices A and B possessing antiferromagnetically aligned moments [see Fig. 1(a), the extension to three dimensions is straightforward]. This configuration is usually referred to as a G-type or checkerboard antiferromagnet, i.e.,when both intraplane and interplane couplings are antiferromagnetic (other collinear bipartite spin structures exist, such as the A-type structure when intraplane coupling is ferromagnetic and inter lane coupling is antiferromagnetic, or the C-type structure when intraplane coupling is antiferromagnetic and interplane coupling is ferromagnetic.) ÎÄÏ×ÉÏ¿´µ½µÄ£¬·ÒëһϾÍÊÇ£ºGÐÍÊÇÃæÄÚºÍÆ½Ãæ¼äñîºÏ¶¼ÊÇ·´Ìú´ÅÐÔ£»AÐÍÊÇÃæÄÚñîºÏÊÇÌú´ÅÐÔ£¬Æ½Ãæ¼äñîºÏÊÇ·´Ìú´Å£»CÐÍÊÇÃæÄÚñîºÏÊÇ·´Ìú´ÅÐÔ£¬Æ½Ãæ¼äñîºÏÊÇÌú´ÅÐÔ¡£ |
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