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Marcelo Jaime","submitted_at":"2011-03-14T23:33:31Z","abstract_excerpt":"High field specific heat, Cp, and magnetic susceptibility, \\c{hi}, measurements were performed on the quasi-two dimensional Heisenberg antiferromagnet [Cu(pyz)2(pyO)2](PF6)2. While no Cp anomaly is observed down to 0.5 K in zero magnetic field, the application of field parallel to the crystallographic ab-plane induces a lambda-like anomaly in Cp, consistent with Ising-type magnetic order. On the other hand, when the field is parallel to the c-axis, Cp and \\c{hi} show evidence of XY-type antiferromagnetism. 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