The metamagnetic behavior of the low temperature properties of single crystal Co(pyridine)2Cl2 is discussed. At 1.25 K oriented single crystals exhibit a two-step metamagnetic transition at applied fields ~0.8 and 1.6 kG along the b-axis, a single transition at ~0.7 kG for applied fields along the a* axis, and a single transition at ~4.2 kG for an applied field along the c axis. Just above the transition fields a moment of 2µB/Co atom is measured for B0 parallel to the a* axis or b axis, and 0.4µB/Co atom is measured for the B0 parallel to the c axis. A large field dependent moment is observed at high fields. Many features of this compound closely mirror the behavior of CoCl2-2H20. However, the Co(pyridine)2Cl 2 has a much smaller interchain exchange, so that many features can be examined at lower fields. The basic features are consistent with a six-sublattice model for the ordered antiferromagnetic system. Measurements of magnetic moment versus temperature show that Co(pyridine)2Cl 2 does not obey a Curie-Weiss law even at relatively high temperatures.



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© 1978 American Institute of Physics (AIP), All rights reserved.

Publication Date

01 Jun 1978

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Chemistry Commons