ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
(4-pic)2Cu3Cl8 and (4-pic)2Cu3Br8 contain planar, bibridged copper halide trimers. The trimers are then stacked with longer semicoordinate Cu–halide–Cu bonds between adjacent trimers. The magnetic susceptibilities show that trimers are in a spin-1/2 ground state at low temperatures with coupling constants J/k=30 and −100 K, respectively, determined by fitting the data to a new high-temperature expansion with only exchange constants and external field as expansion parameters. We show that even though the spin-1/2 trimers are antiferromagnetically exchange coupled along the chain, they order ferromagnetically at low temperature providing examples of pseudo-one-dimensional, S=1/2, Heisenberg ferromagnets. Electron paramagnetic resonance measurements at the X band were also performed and confirm the susceptibility measurements.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340909