Homometallic ferrimagnetism in the zig-zag chain compound Na2Cu5Si4O14


The structure of Na2Cu5Si4O14 is comprised of zig-zag chains of alternating Cu edge-sharing dimers and trimers, with different magnetic ground states, allowing the occurrence of homometallic ferrimagnetism. The magnetic susceptibility data are consistent with that of a ferrimagnetic chain compound, and are predicted using a model that considers interactions intra-trimers (related to the exchange integral J(1)=-224.9 K), intra-dimer (J(3)=40.22 K), and inter dimer-trimer (J(2)=-8.01 K). The magnetic interaction between the antiferromagnetic trimer and ferromagnetic dimer is in accordance with the Goodenough rules applied to the Cu-O topology. A three-dimensional antiferromagnetic ordering is observed below T-N=8 K, corresponding to the magnetic ordering between chains. In addition, since T-N similar to theta(p) there is not a significant degree of frustration in the chain ordering.



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Reis, MS; dos Santos, AM; Amaral, VS; Brandao, P; Rocha, J

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