ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Magnetic susceptibility measurements of the tetrahedrally coordinated system [(CH3C(NH2)2]2CuCl4 show it to be a weak pseudo-one-dimensional antiferromagnet with the dominant exchange, J2/kB =−2.15 K, directed along chains of magnetic Cu++ ions. A weaker intraplanar exchange, J1/kB =0.66 K, indicates ferromagnetic ordering between chains. Susceptibility data reveal an unexpected double peak at 2.5 and 1.8 K, suggesting the interesting possibility of two phase transitions corresponding to antiferromagnetic ordering of different sublattice pairs. Consistent with crystallographic data, these sublattice pairs are formed by two crystallographically distinct distorted tetrahedral CuCl4 groups linked into chains by intermediate acetamidinium ions. This interpretation is consistent with critical electron paramagnetic resonance linewidth broadening of two separate resonances at the two reported temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340884
