Homometallic ferrimagnetism in the zig-zag chain compound Na2Cu5Si4O14

authors	Reis, MS; dos Santos, AM; Amaral, VS; Brandao, P; Rocha, J
nationality	International
journal	PHYSICAL REVIEW B
keywords	MAGNETIC-PROPERTIES; EXCHANGE; TRANSITION; DYNAMICS; 1D
abstract	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.
publisher	AMERICAN PHYSICAL SOC
issn	1098-0121
year published	2006
volume	73
issue	21
digital object identifier (doi)	10.1103/PhysRevB.73.214415
web of science category	Physics, Condensed Matter
subject category	Physics
unique article identifier	WOS:000238696200079